I Question 1 B 2 pts '0 1 9 Details In a study, the data you collect is Letter grade (A,B,C,D,F). This data is: 0 Quantitative O Qualitative Question Help: 8 Message instructor Submit Question I Question 2 B 4 pts '0 1 6 Details A political scientist surveys 29 of the current 153 representatives in a state's legislature. a. What is the size of the sample: C] b. What is the size of the population: C] Question Help: El Message instructor Submit Question 0 Question 3 l3 6 pts '0 1 6) Details You would like to investigate whether smokers are more likely than nonsmokers to get lung cancer. You take the students in your class, select half at random and tell them to smoke a pack of cigarettes each day, and you tell the other half not to ever smoke. Fifty years from now, you will analyze whether more smokers than nonsmokers got lung cancer. a. Is this an experiment or an observational study? 0 Experiment 0 Observational Study b. Summarize at least three issues or nractical difficulties with this plan. I Question 4 E 5 pts '0 1 (9 Details For each question below, please select the sampling method that most closely matches the description. You may use each method more than once. a. You want to investigate the voter's opinions on an upcoming issue for your city. You obtain a list of the registered voters and randomly select 100 names. You contact each of the randomly chosen voters and ask for their opinion. Select an answer I b. You want to investigate the voters opinions on an upcoming issue for your city. The city that you live in has 12 different neighborhoods. You randomly select 10 registered voters from each neighborhood and contact them to ask for their opinion. Select an answer I c. A surveyor was standing in a mall. The surveyor asked 30 people to participate in their survey as they walked by. Select an answer I d. You work for a company as a quality control specialist. You want to check the current production of products for defects. Your factory has 5 different assembly lines. At the end of the day, you randomly choose two of the assembly lines and inspect each item produced by that assembly line. Select an answer v e. You work for a company as a quality control specialist. You want to check the current production of products for defects. At the end of the day, you assign a number to each item that was produced. You randomly choose 20 numbers and inspect the items that correspond to the randomly chosen numbers. Select an answer v Question 5 13 pts 0 1 0 Details The lengths (in kilometers) of a random sample of 18 rivers on the South Island of New Zealand that flow to the Pacific Ocean are listed in table below. Lengths of Rivers (in km) 90 121 56 97 48 145 98 64 66 167 322 28 8 209 64 80 72 93 For the data shown above, find the following. Please don't round your answers. a. Find the 5-number summary: What units would go on each of your answers above? b. Compute the IQR. Put your answer in the first box and the correct units in the second box. c. What is the lower fence for this data set? What is the upper fence for this data set? d. Which of the following is the correct modified boxplot for the data? -20 0 20 40 60 80 10052014076080209220240 250 289320320340 368 Lengths of Rivers (in km) Q 140 O O 40 -20 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 500 320 340 Lengths of Rivers (in km) -20 0 20 40 60 80 100520140760780209226240260 289320320340360 Lengths of Rivers (in km) a O 145 209 O 40 60 80 100120140160180200220240260280300320340 Lengths of Rivers (in km) a0 Question 6 C1\" 9 pts '0 1 6) Details A home pregnancy test was given to people who might be pregnant. Then to check its accuracy, each person was given a blood test to see if they really were pregnant. The following table shows the home pregnancy test results for people who were and were not actually pregnant. Positive Home Test Negative Home Test Total Pregnant 68 6 74 Not Pregnant 9 78 87 Total 77 84 1 61 Round your answers to 4 decimal places. a. What is the probability of getting a postive home test? C] b. What is the probability of getting a postive home test and not being pregnant? C] c. What is the probability of getting a negative home test given the person is pregnant? [:] Question Help: 8 Message instructor Add Work Submit Question 0 Question 7 Ci" 6 pts 0 1 6) Details American Airlines' flights from Chicago to Seattle are on time 60 96 of the time. Suppose 5 flights are randomly selected, and the number of on-time flights is recorded. Round answers to 4 decimal places. a. The probability that exactly 4 flights are on time is :} b. The probability that at most 4 ights are on time is :. c. The probability that at least 4 flights are on time is S. Question Help: 8 Message instructor Add Work 0 Question 8 E 8 pts '0 1 G) Details The heights of 10-year-olds, regardless of gender, closely follow a Normal distribution with a mean of 54 inches and a standard deviation of 5 inches. a. What is the probability that a randomly chosen 10-year-old is shorter than 49 inches? (Round to 4 b. If the tallest 10% of the class is considered "very tall", what is the height cutoff for "very tall"? {Round to Question Help: a Message instructor Add Work Submit All Parts I Question 9 E 12 pts '0 1 G) Details According to the article "Are Babies Normal?" by Traci Clemons and Marcello Pagano published in The American Statistician, Vol. 53, No. 4, pp. 298-302, the birth weights of babies are normally distributed with a mean of 3332 grams and a standard deviation of 566 grams. a. What is the probability that a randomly selected baby weighs between 3000 grams and 3500 grams? Round your answer to 4 decimal places. :] b. If we randomly select 28 babies and average their weights, write about and check each of the conditions needed to use the Central Limit Theorem in context. Conditions: 5 c. What is the probability that the average weight of 28 randomly selected babies is between 3000 grams and 3500 grams? Round your answer to 4 decimal places. :] d. Why did the probability increase? 0 The probability increased since the sample size increased and the distribution of sample means is more spread out. 0 The probability increased since the sample size increased and the sample means are more concentrated near the mean of 3332 grams. 0 Question 10 [Z 12 pts '0 1 G) Details Based on past experience, a bank believes that 7% of the people who receive loans will not make their payments on time. The bank has recently approved 200 loans. a. Write about and check each of the conditions needed in the context of this situation to use the Central Limit Theorem for the proportion of people who will not make their payments on time. Conditions: // What are the mean and standard deviation of this model? b. Mean = C] c. Standard deviation (accurate to 4 decimal places} = C] d. What is the probability that 10% or more of these clients will not make timely payments to 4 decimal places? C] Question Help: E] Message instructor Add Work Submit Question 0 Question 11 E 9 pts '0 1 G) Details Out of 200 people sampled, 32 had kids. Assuming the conditions are met, construct a 90% confidence interval for the true population proportion of people with kids. a. Give your confidence interval in decimal form. Use 4 decimal places in your calculations and round your answers to three decimal places. b. Interpret the confidence interval in context: Question Help: E] Message instructor Add Work Submit Question I Question 12 E 6 pts 0 1 6) Details Based on historical data at Oxnard college, they believe that 39% of freshmen do not visit their advisors regularly. For this year, you would like to obtain a new sample to estimate the proportion of freshmen who do not visit their advisors regularly. You would like to be 95% confident that your estimate is within 4.5% of the true population proportion. How large of a sample size is required? ma Question Help: El Message instructor Add Work Submit Question I Question 13 E 14 pts 0 1 G) Details A researcher claims that 45% of U.S. adults think the IRS is not aggressive enough in pursuing wealthy people who cheat on their taxes. You believe the true percentage is more than 45%. To test this, you take a simple random sample of 300 U.S. adults and find that 156 of them say the IRS is not aggressive enough. Test your claim with a significance level of .05. Hu:| Select an answer V II Select an answer v | C] HM Select an answer v | | Select an answer v l C] The sample size is: C] The value for 13 to 4 decimal places is: C] Test Statistic to 4 decimal places: C] P-value to 4 decimal places: C] Is the result significant? Select an answer v Based on the above we choose to: There Select an answer v enough evidence to conclude | Select an answer Question Help: El Message instructor Add Work Submit Question 0 Question 14 E 14 pts 0 1 G) Details Research was conducted on the number of miles people trained to run a 5K race and the time they took to run the race. The researcher recorded the number of miles run during training (total in a 1 month period) and the time to complete the 5K race. The results are below. Use technology to make a scatterplot and answer the questions below. Miles Trained in 1 Month 5K Race Time (Minutes) a. Give the correlation coefficient. (4 decimal places) b. Give the equation of the regression line. Round the values to 4 decimal places. g: lwl c. Interpret the y-intercept in the context of the data. (Explain it's meaning including the value, units and whether it makes sense in this context) d. Interpret the slope in the context of the data. (Explain it's meaning including the value and units) A e. Predict the time to run the 5K if someone trained 60 miles (to 3 decimal places). f. Give the residual for 60 miles trained (to 3 decimal places). Question Help: 8 Message instructor Add Work Submit Question \"22>