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Questions and Answers of Statistics

n = 75, p = 0.75, x = 60Compute P(x) using the binomial probability formula. Then determine whether the normal distribution can be used as an approximation for the binomial distribution. If so,
n = 85, p = 0.8, x = 70Compute P(x) using the binomial probability formula. Then determine whether the normal distribution can be used as an approximation for the binomial distribution. If so,
According to American Airlines, Flight 215 from Orlando to Los Angeles is on time 90% of the time. Randomly select 150 ﬂights and use the normal approximation to the binomial to(a) approximate the
Almanac, 80% of adult smokers started smoking before they were 18 years old. Suppose 100 smokers 18 years old or older are randomly selected. Use the normal approximation to the binomial to (a)
In a recent poll, the Gallup Organization found that 45% of adult Americans believe that the overall state of moral values in the United States is poor. Suppose a survey of a random sample of 500
According to a study done by Nick Wilson of Otago University Wellington, the probability a randomly selected individual will not cover his or her mouth when sneezing is 0.267. Suppose you sit on a
According to the Current Population Survey (Internet release date: September 15, 2004), 55% of males between the ages of 18 and 24 years lived at home in 2003. A survey is administered at a community
According to the Current Population Survey (Internet release date: September 15, 2004), 46% of females between the ages of 18 and 24 years lived at home in 2003. A survey is administered at a
In a Gallup poll, 37% of survey respondents said that, if they only had one child, they would prefer the child to be a boy. You conduct a survey of 150 randomly selected students on your campus and
According to a USA Today “Snapshot,” 3% of Americans surveyed lie frequently. You conduct a survey of 500 college students and ﬁnd that 20 of them lie frequently.(a) Compute the probability
Under what conditions is the sampling distribution of x̄ normal?
The total energy need during pregnancy is normally distributed, with mean µ = 2600 kcal/day and standard deviation σ = 50 kcal/day.(a) What is the probability that a randomly selected pregnant
A machine at K&A Tube & Manufacturing Company produces a certain copper tubing component in a refrigeration unit. The tubing components produced by the manufacturer have a mean diameter of 0.75 inch
Based on data obtained from A. C. Nielsen, the mean number of televisions in a household in the United States is 2.24. Assume that the population standard deviation number of television sets in the
A Gallup survey indicated that 72% of 18- to 29-year-olds, if given a choice, would prefer to start their own business rather than work for someone else. A random sample of 600 18- to 29-year-olds is
According to the U.S. Census Bureau, 10% of adults 25 years and older in the United States had advanced degrees in 2009. A researcher with the U.S. Department of Education surveys 500 randomly
During the course of a typical season, suppose a batter has 500 at-bats. This means the player has the opportunity to get a hit 500 times during the course of a season. Further, suppose a batter is a
If a random sample of 36 is obtained from a population with mean 50 and standard deviation 24, what is the mean and standard deviation of the sampling distribution of the sample mean?
The charge life of a certain lithium ion battery for camcorders is normally distributed, with mean 90 minutes and standard deviation 35 minutes.(a) What is the probability that a randomly selected
A machine used for ﬁlling plastic bottles with a soft drink has a known standard deviation of σ = 0.05 liter. The target mean ﬁll volume is µ = 2.0 liters.(a) Describe the sampling distribution
According to the National Center for Health Statistics (2004), 22.4% of adults are smokers. A random sample of 300 adults is obtained.(a) Describe the sampling distribution of , the sample proportion
Peanut and tree nut allergies are considered to be the most serious food allergies. According to the National Institute of Allergy and Infectious Diseases, roughly 1% of Americans are allergic to
According to Wikipedia.com, net worth is deﬁned as total assets (value of house, cars, money, etc.) minus total liabilities (mortgage balance, credit card debt, etc.). According to a recent study
A simple random sample of size n = 10 is obtained from a population that is normally distributed with µ = 30 and σ = 8. What is the sampling distribution of x̄?
A simple random sample of size n = 40 is obtained from a population with µ = 50 and σ = 4. Does the population need to be normally distributed for the sampling distribution of x to be approximately
Determine µx̄ and σx̄ from the given parameters of the population and the sample size.µ = 80, σ = 14, n = 49
Determine µx̄ and σx̄ from the given parameters of the population and the sample size.µ = 64, σ = 18, n = 36
Determine µx̄ and σx̄ from the given parameters of the population and the sample size.µ = 52, σ = 10, n = 21
Determine µx̄ and σx̄ from the given parameters of the population and the sample size.µ = 27, σ = 6, n = 15
Answer the following questions for the sampling distribution of the sample mean shown.(a) What is the value of µxÌ„? (b) What is the value of ÏƒxÌ„? (c) If the
Answer the following questions for the sampling distribution of the sample mean shown.(a) What is the value of µxÌ„?(b) What is the value of ÏƒxÌ„?(c) If the sample size is n = 9, what is
A simple random sample of size n = 49 is obtained from a population with µ = 80 and σ = 14.(a) Describe the sampling distribution of x̄.(b) What is P(x̄ > 83)?(c) What is P(x̄ ≤ 75.8)?(d)
A simple random sample of size n = 36 is obtained from a population with µ = 64 and σ = 18.(a) Describe the sampling distribution of x̄.(b) What is P(x̄ < 62.6)?(c) What is P(x̄ ≥ 68.7)?(d)
A simple random sample of size n = 12 is obtained from a population with µ = 64 and σ = 17.(a) What must be true regarding the distribution of the population in order to use the normal model to
A simple random sample of size n = 20 is obtained from a population with µ = 64 and σ = 17.(a) What must be true regarding the distribution of the population in order to use the normal model to
The length of human pregnancies is approximately normally distributed with mean µ = 266 days and standard deviation σ = 16 days.(a) What is the probability a randomly selected pregnancy lasts less
The upper leg length of 20- to 29-year-old males is normally distributed with a mean length of 43.7 cm and a standard deviation of 4.2 cm.(a) What is the probability that a randomly selected 20- to
The reading speed of second grade students is approximately normal, with a mean of 90 words per minute (wpm) and a standard deviation of 10 wpm.(a) What is the probability a randomly selected student
The most famous geyser in the world, Old Faithful in Yellowstone National Park, has a mean time between eruptions of 85 minutes. If the interval of time between eruptions is normally distributed with
The S&P 500 is a collection of 500 stocks of publicly traded companies. Using data obtained from Yahoo! Finance, the monthly rates of return of the S&P 500 since 1950 are normally
Based on tests of the Chevrolet Cobalt, engineers have found that the miles per gallon in highway driving are normally distributed, with a mean of 32 miles per gallon and a standard deviation of 3.5
The shape of the distribution of the time required to get an oil change at a 10-minute oil-change facility is unknown. However, records indicate that the mean time for an oil change is 11.4 minutes,
The quality-control manager of a Long John Silver’s restaurant wishes to analyze the length of time that a car spends at the drive-through window waiting for an order. According to records obtained
The Food and Drug Administration sets Food Defect Action Levels (FDALs) for some of the various foreign substances that inevitably end up in the food we eat and liquids we drink. For example, the
Suppose that cars arrive at Burger King’s drive-through at the rate of 20 cars every hour between 12:00 noon and 1:00 P.M. A random sample of 40 one-hour time periods between 12:00 noon and 1:00
The amount of time Americans spend watching television is closely monitored by ﬁrms such as A. C. Nielsen because this helps to determine advertising pricing for commercials.(a) Do you think the
According to Crown ATM Network, the mean ATM withdrawal is $67. Assume that the standard deviation for withdrawals is $35.(a) Do you think the variable “ATM withdrawal” is normally distributed?
The following data represent the ages of the winners of the Academy Award for Best Actor for the years 2004–2009.004: Jamie Foxx ...........372005: Philip Seymour Hoffman .....382006: Forest
The following data represent the running lengths (in minutes) of the winners of the Academy Award for Best Picture for the years 2004–2009.2004: Million Dollar Baby .....1322005: Crash
In the game of roulette, a wheel consists of 38 slots numbered 0, 00, 1, 2, . . . , 36. To play the game, a metal ball is spun around the wheel and is allowed to fall into one of the numbered slots.
Technically, we assume that we are obtaining simple random samples from inﬁnite populations when obtaining sampling distributions. If the size of the population is ﬁnite, we technically need a
For the three probability distributions shown, rank each distribution from lowest to highest in terms of the sample size required for the distribution of the sample mean to be approximately normally
Suppose Jack and Diane are each attempting to use simulation to describe the sampling distribution from a population that is skewed left with mean 50 and standarddeviation 10. Jack obtains 1000
n = 500, p = 0.4Describe the sampling distribution of . Assume that the size of the population is 25,000 for each problem.
n = 300, p = 0.7Describe the sampling distribution of . Assume that the size of the population is 25,000 for each problem.
n = 1000, p = 0.103Describe the sampling distribution of . Assume that the size of the population is 25,000 for each problem.
n = 1010, p = 0.84Describe the sampling distribution of . Assume that the size of the population is 25,000 for each problem.
A simple random sample of size n = 75 is obtained from a population whose size is N = 10,000 and whose population proportion with a speciï¬ed characteristic is p = 0.8.(a) Describe the sampling
A simple random sample of size n = 200 is obtained from a population whose size is N = 25,000 and whose population proportion with a speciï¬ed characteristic is p = 0.65.(a) Describe the sampling
A simple random sample of size n = 1000 is obtained from a population whose size is N = 1,000,000 and whose population proportion with a speciﬁed characteristic is p = 0.35.(a) Describe the
A simple random sample of size n = 1460 is obtained from a population whose size is N = 1,500,000 and whose population proportion with a speciﬁed characteristic is p = 0.42.(a) Describe the
According to a study done by Wakeﬁeld Research, the proportion of Americans who can order a meal in a foreign language is 0.47.(a) Suppose a random sample of 200 Americans is asked to disclose
According to a study done by the Gallup organization, the proportion of Americans who are satisﬁed with the way things are going in their lives is 0.82.(a) Suppose a random sample of 100 Americans
According to a study done by the Pew Research Center, 39% of adult Americans believe that marriage is now obsolete.(a) Suppose a random sample of 500 adult Americans is asked whether marriage is
According to creditcard.com, 29% of adults do not own a credit card.(a) Suppose a random sample of 500 adults is asked, “Do you own a credit card?” Describe the sampling distribution of , the
According to a study conducted by the Gallup organization, the proportion of Americans who are afraid to ﬂy is 0.10. A random sample of 1100 Americans results in 121 indicating that they are afraid
Exit polling is a popular technique used to determine the outcome of an election prior to results being tallied. Suppose a referendum to increase funding for education is on the ballot in a large
A shipment of 50,000 transistors arrives at a manufacturing plant. The quality control engineer at the plant obtains a random sample of 500 resistors and will reject the entire shipment if 10 or more
sample proportion of adults who respond yes, is approximately normal, how many more adult Americans does the researcher need to sample if(a) 10% of all adult Americans support the changes?(b) 20% of
(a) 90% of all teenagers aged 13 to 17 have never been prescribed medication for ADHD?(b) 95% of all teenagers aged 13 to 17 have never been prescribed medication for ADHD?
In this section, we assumed that the sample size was less than 5% of the size of the population. When sampling without replacement from a ﬁnite population in which n > 0.05N, the standard deviation
Find the critical t-value for constructing a conﬁdence interval for a population mean at the given level of conﬁdence for the given sample size,n. (a) 99% conﬁdence;n = 18 (b) 90% conﬁdence;n
What does the 95% represent in a 95% conﬁdence interval?
Which is larger, the area under the t-distribution with 10 degrees of freedom to the right of t = 2.32 or the area under the standard normal distribution to the right of z = 2.32? Why?
State the properties of Student’s t-distribution.
A simple random sample of size n is drawn from a population. The sample mean, x̄, is 54.8 and the sample standard deviation is10.5.(a) Construct the 90% conﬁdence interval for the population mean
A simple random sample of size n is drawn from a population that is known to be normally distributed. The sample mean, x, is determined to be 104.3 and the sample standard deviation, s, is determined
In a survey of 35 adult Americans, it was found that the mean age (in years) that people would like to live to is 87.9 with a standard deviation of 15.5.An analysis of the raw data indicates the
One question asked in the General Social Survey was this: “How many e-mails do you send in a day?” The results of 928 respondents indicate that the mean number of e-mails sent in a day is 10.4,
Researchers conducted an experiment to determine the effectiveness of a commercial caffeinated carbohydrate–electrolyte sports drink compared with aplacebo. Sixteen highly trained cyclists each
A random sample of 60 married couples who have been married 7 years was asked the number of children they have.The results of the survey are as follows:(a) What is the shape of the distribution of
The diameter of the Douglas ï¬r tree is measured at a height of 1.37 meters.The following data represent the diameter in centimeters of a random sample of 12 Douglas ï¬rs in the western
In a random sample of 678 adult males 20 to 34 years of age, it was determined that 58 of them have hypertension (high blood pressure).(a) Obtain a point estimate for the proportion of adult males 20
Find the critical t-value for constructing a conﬁdence interval about a population mean at the given level of conﬁdence for the given sample size,n. (a) 96% conﬁdence; n = 26 (b) 98%
Determine the point estimate of the population mean and margin of error if the conﬁdence interval has lower bound: 125.8 and upper bound: 152.6.
A question on the 2006 General Social Survey was this: “How many family members do you know that are in prison?” The results of 499 respondents indicate that the mean number of family members in
A random sample of 50 recent college graduates results in a mean time to graduate of 4.58 years, with a standard deviation of 1.10 years.(a) Compute and interpret a 90% conﬁdence interval for time
The campus at Joliet Junior College has a lake.A student used a Secchi disk to measure the clarity of the lake€™s water by lowering the disk into the water and measuring the distance below the
From a random sample of 1201 Americans, it was discovered that 1139 of them lived in neighborhoods with acceptable levels of carbon monoxide. Source: Environmental Protection Agency.(a) Obtain a
A tennis enthusiast wants to estimate the mean length of men€™s singles matches held during the Wimbledon tennis tournament. From the Wimbledon history archives, he randomly selects 40 matches
Lower bound: 0.201, upper bound: 0.249, n = 1200 Determine the point estimate of the population proportion, the margin of error for each conﬁdence interval, and the number of individuals in the
Determine the point estimate of the population proportion, the margin of error for each conﬁdence interval, and the number of individuals in the sample with the speciﬁed characteristic, x, for
Determine the point estimate of the population proportion, the margin of error for each conﬁdence interval, and the number of individuals in the sample with the speciﬁed characteristic, x, for
Determine the point estimate of the population proportion, the margin of error for each conﬁdence interval, and the number of individuals in the sample with the speciﬁed characteristic, x, for
Construct a conﬁdence interval of the population proportion at the given level of conﬁdence.x = 30, n = 150, 90% conﬁdence
Construct a conﬁdence interval of the population proportion at the given level of conﬁdence.x = 80, n = 200, 98% conﬁdence
Construct a conﬁdence interval of the population proportion at the given level of conﬁdence.x = 120, n = 500, 99% conﬁdence
Construct a conﬁdence interval of the population proportion at the given level of conﬁdence.x = 400, n = 1200, 95% conﬁdence
Construct a conﬁdence interval of the population proportion at the given level of conﬁdence.x = 860, n = 1100, 94% conﬁdence
Construct a conﬁdence interval of the population proportion at the given level of conﬁdence.x = 540, n = 900, 96% conﬁdence

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