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Question 1 (1 point) Exhibit 8-12 In order to estimate the average time spent on an exam at a local university, data were collected from a sample of 36 business students over a one-week period. Assume the population standard deviation is 6 hours. Refer to Exhibit 8-12. With a .95 probability, the margin of error is approximately O 21 1.96 O.26 1.64 Question 2 (1 point) Which of the following is an improper form of the null and alternative hypotheses? OHOH SHO and Had toExcel Problem Question 3 (1 point) A population has a mean of 180 and a standard deviation of 36. A sample of 81 observations will be taken. The probability that the mean from that sample will be between 182 and 178 is 0.8185 0.0228 O 0.1359 0.3829Question 4 (1 point) The number of random samples (without replacement) of size 3 that can be drawn from a population of size 7 is 35 Oo O 2 Question 5 (1 point) Exhibit 9-31 n = 64 Ho: M = 60 x= 64.8 H: ul * 60 0 = 24 Refer to Exhibit 9-31. The p-value is equal to 1096Question 5 (1 point) Exhibit 9-31 n = 64 Ho: u = 60 x = 64.8 Ha: u * 60 0 = 24 Refer to Exhibit 9-31. The p-value is equal to O.1096 O.2302 -0548 2698 Question 6 (1 point) If we want to provide a 95% confidence interval for the mean of a population, the Z value is. O .485 O .95 1.96Question 7 (1 point) In stats we can either use a critical value or a p-value approach for hypothesis testing. If the p-value approach our decision rule is to reject the null hypothesis if_ Op-value is 1 Op-value = z Op-value s a Op-value > a Question 8 (1 point) Exhibit 8-31 A random sample of 36 automobiles traveling on a section of an interstate showed an average speed of 60 mph. The distribution of speeds of all cars on this section of highway is normally distributed, with a standard deviation of 12 mph. Refer to Exhibit 8-31. If the sample size was 49 (other factors remain unchanged), the interval for a would O become wider become narrower O not changeQuestion 8 (1 point) Exhibit 8-31 A random sample of 36 automobiles traveling on a section of an interstate showed an average speed of 60 mph. The distribution of speeds of all cars on this section of highway is normally distributed, with a standard deviation of 12 mph. Refer to Exhibit 8-31. If the sample size was 49 (other factors remain unchanged), the interval for / would become wider O become narrower O not change O become zero Question 9 (3 points) Laura Naples, manager of Heritage Inn, periodically collects and tabulates information about a sample of the hotel's overnight guests. This information aids her in pricing and scheduling decisions she must make. The table below lists data on 10 randomly selected hotel registrants, collected as the registrants checked out. The data listed are: . Number of people in the group . Hotel's shuttle service used: yes or no . Total telephone charges incurred . Reason for stay: business or personalQuestion 9 (3 points) Laura Naples, manager of Heritage Inn, periodically collects and tabulates information about a sample of the hotel's overnight guests. This information aids her in pricing and scheduling decisions she must make. The table below lists data on 10 randomly selected hotel registrants, collected as the registrants checked out. The data listed are; . Number of people in the group . Hotel's shuttle service used: yes or no Total telephone charges incurred . Reason for stay: business or personal Name of Registrant Number in Group Shuttle Used Telephone Charges ($) Reason for Stay Madam Sandler 2 yes Olpersonal Michelle Pepper 2 no 4.3 business Claudia Shepler 1 no 3.2 business Annette Rodriquez 2 no 2.9 business Tony DiMarco 2 yes 2.3 personal Amy Franklin 3 yes 4.65 business Julio Roberts 2 no 5.6 personal Edward Blackstone 3 yes 2.1 personal Sara Goldman 1 no 1.85 business Todd Atherton 2 no 5.8 business a. Do you use a normal (Z) or a T-distribution? Why? b. Before cell telephones became so common, the average telephone charge per registered group was at least $5.00. Laura suspects that the average has dropped. Test Ho: H 2 5 and Ha: u 75 O Ho: M * 75 Ha: 1 = 75 OHO:1 = 75 Ha:14 x 75 Question 14 (1 point) If the population involves an ongoing process that makes listing or counting every element in the population impossible, we consider N to be infinite known O finite O skewedQuestion 14 (1 point) If the population involves an ongoing process that makes listing or counting every element in the population impossible, we consider N to be infinite known finite O skewed Question 15 (1 point) The : distribution should be used whenever the population is not normally distributed the sample size is less than 30 the population standard deviation is unknown None of the answers is correct. Page 5 of 7 Previous Page Next PageQuestion 16 (1 point) Exhibit 9-61 A random sample of 64 people was taken. Forty percent of the people in the sample favored Candidate H. We are interested in determining whether or not the proportion of the population in favor of Candidate H is significantly more than 50%. Refer to Exhibit 9-61. The test statistic is -2.80 O 1.6 O -1.6 1.25 Question 17 (1 point) Exhibit 9-31 n = 64 Ho: M = 60 x = 64.8 H : # 60 0 = 24Question 17 (1 point) Exhibit 9-31 n = 64 Ho: H = 60 x= 64.8 H : u # 60 0 = 24 Refer to Exhibit 9-31. The test statistic equals O 1.6 .396 1.2 O-1.2 Question 18 (1 point) Exhibit 8-31 A random sample of 36 automobiles traveling on a section of an interstate showed an average speed of 60 mph. The distribution of speeds of all cars on this section of highway is normally distributed, with a standard deviation of 12 mph. Refer to Exhibit confidence interval for / isQuestion 18 (1 point) Exhibit 8-31 A random sample of 36 automobiles traveling on a section of an interstate showed an average speed of 60 mph. The distribution of speeds of all cars on this section of highway is normally distributed, with a standard deviation of 12 mph. Refer to Exhibit 8-31. The 90% confidence interval for u is 58.148 to 60.852 56.71 to 63.29 57.735 to 62.265 60 to 70 Previous Page Next Page Page 6 of 7Question 19 (1 point) If we change a 95% confidence interval estimate to a 90% confidence interval estimate, we can expect the width of the confidence interval to remain the same width of the confidence interval to increase width of the confidence interval to decrease sample size to increase Question 20 (1 point) A sample of 80 observations will be taken from a process (an infinite population). The population proportion equals . 16. The probability that the sample proportion will be less than . 1768 is O.3409 9222 O.0778 O.6591Question 20 (1 point) A sample of 80 observations will be taken from a process (an infinite population). The population proportion equals .16. The probability that the sample proportion will be less than . 1768 is O.3409 O .9222 1 0778 O.6591 Question 21 (1 point) If the hypotheses are Ho: u = 60 Ha: u # 60, we need to do a hypothesis test in in both tails of the sampling distribution only in the lower tail of the sampling distribution only in the upper tail of the sampling distribution O in one tail of the sampling distribution Previous Page