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Questions and Answers of
Business Statistics
A statistics instructor believes that fewer than 20% of Evergreen Valley College (EVC) students attended the opening midnight showing of the latest Harry Potter movie. She surveys 84 of her students
It is believed that Lake Tahoe Community College (LTCC) Intermediate Algebra students get less than seven hours of sleep per night, on average. A survey of 22 LTCC Intermediate Algebra students
Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the phone. The organization thinks that, currently, the mean is higher. Fifteen randomly chosen teenagers
It is believed that Lake Tahoe Community College (LTCC) Intermediate Algebra students get less than seven hours of sleep per night, on average. A survey of 22 LTCC Intermediate Algebra students
From generation to generation, the mean age when smokers first start to smoke varies. However, the standard deviation of that age remains constant of around 2.1 years. A survey of 40 smokers of this
An article in the San Jose Mercury News stated that students in the California state university system take 4.5 years, on average, to finish their undergraduate degrees. Suppose you believe that the
In 1955, Life Magazine reported that the 25 year-old mother of three worked, on average, an 80 hour week. Recently, many groups have been studying whether or not the women's movement has, in fact,
A Nissan Motor Corporation advertisement read, “The average man’s I.Q. is 107. The average brown trout’s I.Q. is 4.So why can’t man catch brown trout?” Suppose you believe that the brown
According to an article in Newsweek, the natural ratio of girls to boys is 100:105. In China, the birth ratio is 100: 114 (46.7% girls). Suppose you don’t believe the reported figures of the
The mean work week for engineers in a start-up company is believed to be about 60 hours. A newly hired engineer hopes that it’s shorter. She asks ten engineering friends in start-ups for the
Sixty-eight percent of online courses taught at community colleges nationwide were taught by full-time faculty. To test if 68% also represents California’s percent for full-time faculty teaching
The mean age of De Anza College students in a previous term was 26.6 years old. An instructor thinks the mean age for online students is older than 26.6. She randomly surveys 56 online students and
Registered nurses earned an average annual salary of \($69,110.\) For that same year, a survey was conducted of 41 California registered nurses to determine if the annual salary is higher than
La Leche League International reports that the mean age of weaning a child from breastfeeding is age four to five worldwide. In America, most nursing mothers wean their children much earlier. Suppose
Over the past few decades, public health officials have examined the link between weight concerns and teen girls' smoking. Researchers surveyed a group of 273 randomly selected teen girls living in
A statistics instructor believes that fewer than 20% of Evergreen Valley College (EVC) students attended the opening night midnight showing of the latest Harry Potter movie. She surveys 84 of her
According to the Center for Disease Control website, in 2011 at least 18% of high school students have smoked a cigarette. An Introduction to Statistics class in Davies County, KY conducted a
Driver error can be listed as the cause of approximately 54% of all fatal auto accidents, according to the American Automobile Association. Thirty randomly selected fatal accidents are examined, and
For Americans using library services, the American Library Association claims that at most 67% of patrons borrow books. The library director in Owensboro, Kentucky feels this is not true, so she
A survey in the N.Y. Times Almanac finds the mean commute time (one way) is 25.4 minutes for the 15 largest US cities. The Austin, TX chamber of commerce feels that Austin’s commute time is less
According to the N.Y. Times Almanac the mean family size in the U.S. is 3.18. A sample of a college math class resulted in the following family sizes: 5; 4; 5; 4; 4; 3; 6; 4; 3; 3; 5; 5; 6; 3; 3; 2;
The student academic group on a college campus claims that freshman students study at least 2.5 hours per day, on average. One Introduction to Statistics class was skeptical. The class took a random
Identify the following:a. x̄ =_______b. sx =_______c. n =_______d. n – 1 =_______ A hospital is trying to cut down on emergency room wait times. It is interested in the amount of time patients
Define the random variables X and x̄ in words.A hospital is trying to cut down on emergency room wait times. It is interested in the amount of time patients must wait before being called back to be
Which distribution should you use for this problem?A hospital is trying to cut down on emergency room wait times. It is interested in the amount of time patients must wait before being called back to
Construct a 95% confidence interval for the population mean time spent waiting. State the confidence interval, sketch the graph, and calculate the error bound.A hospital is trying to cut down on
Explain in complete sentences what the confidence interval means.A hospital is trying to cut down on emergency room wait times. It is interested in the amount of time patients must wait before being
Identify the following:a. x̄ =_______b. sx =_______c. n =_______d. n – 1 =_______ One hundred eight Americans were surveyed to determine the number of hours they spend watching television each
Which distribution should you use for this problem?One hundred eight Americans were surveyed to determine the number of hours they spend watching television each month. It was revealed that they
Construct a 99% confidence interval for the population mean hours spent watching television per month. (a) State the confidence interval, (b) sketch the graph, and (c) calculate the error bound.One
Why would the error bound change if the confidence level were lowered to 95%?One hundred eight Americans were surveyed to determine the number of hours they spend watching television each month. It
Calculate the following:a. X̅ =______b. sx =______c. n =______ The data in Table 8.2 are the result of a random survey of 39 national flags (with replacement between picks) from various countries.
Define the random variable X̅ in words.The data in Table 8.2 are the result of a random survey of 39 national flags (with replacement between picks) from various countries. We are interested in
What is X̅ estimating?The data in Table 8.2 are the result of a random survey of 39 national flags (with replacement between picks) from various countries. We are interested in finding a confidence
Is σx known?The data in Table 8.2 are the result of a random survey of 39 national flags (with replacement between picks) from various countries. We are interested in finding a confidence interval
As a result of your answer to Exercise 8.15, state the exact distribution to use when calculating the confidence interval.Construct a 95% confidence interval for the true mean number of colors on
How much area is in both tails (combined)?The data in Table 8.2 are the result of a random survey of 39 national flags (with replacement between picks) from various countries. We are interested in
How much area is in each tail?The data in Table 8.2 are the result of a random survey of 39 national flags (with replacement between picks) from various countries. We are interested in finding a
Calculate the following:a. lower limitb. upper limitc. error bound The data in Table 8.2 are the result of a random survey of 39 national flags (with replacement between picks) from various
The 95% confidence interval is_____.The data in Table 8.2 are the result of a random survey of 39 national flags (with replacement between picks) from various countries. We are interested in finding
Fill in the blanks on the graph with the areas, the upper and lower limits of the Confidence Interval and the sample mean.The data in Table 8.2 are the result of a random survey of 39 national flags
In one complete sentence, explain what the interval means.The data in Table 8.2 are the result of a random survey of 39 national flags (with replacement between picks) from various countries. We are
Using the same X̅ , sx , and level of confidence, suppose that n were 69 instead of 39. Would the error bound become larger or smaller? How do you know?The data in Table 8.2 are the result of a
Using the same X̅ , sx , and n = 39, how would the error bound change if the confidence level were reduced to 90%?Why?The data in Table 8.2 are the result of a random survey of 39 national flags
When designing a study to determine this population proportion, what is the minimum number you would need to survey to be 90% confident that the population proportion is estimated to within
If it were later determined that it was important to be more than 90% confident and a new survey were commissioned, how would it affect the minimum number you need to survey? Why?Marketing companies
Identify the following:a. x = ______b. n = ______c. p′ = ______ Suppose the marketing company did do a survey. They randomly surveyed 200 households and found that in 120 of them, the woman made
Define the random variables X and P′ in words.Suppose the marketing company did do a survey. They randomly surveyed 200 households and found that in 120 of them, the woman made the majority of the
Which distribution should you use for this problem?Suppose the marketing company did do a survey. They randomly surveyed 200 households and found that in 120 of them, the woman made the majority of
Construct a 95% confidence interval for the population proportion of households where the women make the majority of the purchasing decisions. State the confidence interval, sketch the graph, and
List two difficulties the company might have in obtaining random results, if this survey were done by email.Suppose the marketing company did do a survey. They randomly surveyed 200 households and
We are interested in finding the 95% confidence interval for the percent of executives who prefer trucks. Define random variables X and P′ in words.Of 1,050 randomly selected adults, 360 identified
Which distribution should you use for this problem?Of 1,050 randomly selected adults, 360 identified themselves as manual laborers, 280 identified themselves as non-manual wage earners, 250
Construct a 95% confidence interval. State the confidence interval, sketch the graph, and calculate the error bound.Of 1,050 randomly selected adults, 360 identified themselves as manual laborers,
Suppose we want to lower the sampling error. What is one way to accomplish that?Of 1,050 randomly selected adults, 360 identified themselves as manual laborers, 280 identified themselves as
The sampling error given in the survey is ±2%. Explain what the ±2% means.Of 1,050 randomly selected adults, 360 identified themselves as manual laborers, 280 identified themselves as non-manual
Define the random variable X in words.A poll of 1,200 voters asked what the most significant issue was in the upcoming election. Sixty-five percent answered the economy. We are interested in the
Define the random variable P′ in words.A poll of 1,200 voters asked what the most significant issue was in the upcoming election. Sixty-five percent answered the economy. We are interested in the
Which distribution should you use for this problem?A poll of 1,200 voters asked what the most significant issue was in the upcoming election. Sixty-five percent answered the economy. We are
Construct a 90% confidence interval, and state the confidence interval and the error bound.A poll of 1,200 voters asked what the most significant issue was in the upcoming election. Sixty-five
What would happen to the confidence interval if the level of confidence were 95%?A poll of 1,200 voters asked what the most significant issue was in the upcoming election. Sixty-five percent answered
What is being counted?The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M., Monday night, ages 8 to 12, beginning
In words, define the random variable X.The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M., Monday night, ages 8 to 12,
Calculate the following:a. x = _______b. n = _______c. p′ = _______ The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M.,
State the estimated distribution of X. X~________ The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M., Monday night, ages
Define a new random variable P′. What is p′ estimating?The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M., Monday
In words, define the random variable P′.The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M., Monday night, ages 8 to 12,
State the estimated distribution of P′. Construct a 92% Confidence Interval for the true proportion of girls in the ages 8 to 12 beginning ice-skating classes at the Ice Chalet.The Ice Chalet
How much area is in both tails (combined)?The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M., Monday night, ages 8 to 12,
How much area is in each tail?The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M., Monday night, ages 8 to 12, beginning
Calculate the following:a. lower limitb. upper limitc. error bound The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M.,
The 92% confidence interval is _______.The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M., Monday night, ages 8 to 12,
Fill in the blanks on the graph with the areas, upper and lower limits of the confidence interval, and the sample proportion.The Ice Chalet offers dozens of different beginning iceskating classes.
In one complete sentence, explain what the interval means.The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M., Monday
Using the same p′ and level of confidence, suppose that n were increased to 100. Would the error bound become larger or smaller? How do you know?The Ice Chalet offers dozens of different beginning
Using the same p′ and n = 80, how would the error bound change if the confidence level were increased to 98%? Why?The Ice Chalet offers dozens of different beginning iceskating classes. All of the
If you decreased the allowable error bound, why would the minimum sample size increase (keeping the same level of confidence)?The Ice Chalet offers dozens of different beginning iceskating classes.
Identify the following:a. x - = _____b. σ = _____c. n = _____ The standard deviation of the weights of elephants is known to be approximately 15 pounds. We wish to construct a 95% confidence
In words, define the random variables X and X̅ .The standard deviation of the weights of elephants is known to be approximately 15 pounds. We wish to construct a 95% confidence interval for the mean
Which distribution should you use for this problem?The standard deviation of the weights of elephants is known to be approximately 15 pounds. We wish to construct a 95% confidence interval for the
Construct a 95% confidence interval for the population mean weight of newborn elephants. State the confidence interval, sketch the graph, and calculate the error bound.The standard deviation of the
What will happen to the confidence interval obtained, if 500 newborn elephants are weighed instead of 50? Why?The standard deviation of the weights of elephants is known to be approximately 15
Identify the following:a. X̅ = _____b. σ = _____c. n = _____ The U.S. Census Bureau conducts a study to determine the time needed to complete the short form. The Bureau surveys 200 people. The
In words, define the random variables X and X̅ .The U.S. Census Bureau conducts a study to determine the time needed to complete the short form. The Bureau surveys 200 people. The sample mean is 8.2
Which distribution should you use for this problem?The U.S. Census Bureau conducts a study to determine the time needed to complete the short form. The Bureau surveys 200 people. The sample mean is
Construct a 90% confidence interval for the population mean time to complete the forms. State the confidence interval, sketch the graph, and calculate the error bound.The U.S. Census Bureau conducts
If the Census wants to increase its level of confidence and keep the error bound the same by taking another survey, what changes should it make?The U.S. Census Bureau conducts a study to determine
If the Census did another survey, kept the error bound the same, and surveyed only 50 people instead of 200, what would happen to the level of confidence? Why?The U.S. Census Bureau conducts a study
Suppose the Census needed to be 98% confident of the population mean length of time. Would the Census have to survey more people? Why or why not?The U.S. Census Bureau conducts a study to determine
Identify the following:a. x - = ______b. σ = ______c. n = ______ A sample of 20 heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each
In words, define the random variable X.A sample of 20 heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each head of lettuce was then
In words, define the random variable X̅ .A sample of 20 heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each head of lettuce was then
Which distribution should you use for this problem?A sample of 20 heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each head of lettuce
Construct a 90% confidence interval for the population mean weight of the heads of lettuce. State the confidence interval, sketch the graph, and calculate the error bound.A sample of 20 heads of
Construct a 95% confidence interval for the population mean weight of the heads of lettuce. State the confidence interval, sketch the graph, and calculate the error bound.A sample of 20 heads of
In complete sentences, explain why the confidence interval in Exercise 8.74 is larger than in Exercise 8.75.Exercise 8.74Construct a 90% confidence interval for the population mean weight of the
In complete sentences, give an interpretation of what the interval in Exercise 8.75 means.Exercise 8.75.Construct a 95% confidence interval for the population mean weight of the heads of lettuce.
What would happen if 40 heads of lettuce were sampled instead of 20, and the error bound remained the same?A sample of 20 heads of lettuce was selected. Assume that the population distribution of
What would happen if 40 heads of lettuce were sampled instead of 20, and the confidence level remained the same?A sample of 20 heads of lettuce was selected. Assume that the population distribution
X̅ = _____ The mean age for all Foothill College students for a recent Fall term was 33.2. The population standard deviation has been pretty consistent at 15. Suppose that twenty-five Winter
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