Question

55. Is the mean height of all adult American males between the ages of 18 and 21 now over 6 ft? In a sample of 100 randomly selected American males between the ages of 18 and 21 the average height was 6.1 it with a standard deviation of 0.21 ft. Which of the following is the appropriate alternative hypothesis? (A) H6 (B) Hu<6 (C) H.: >6 (D) H. :> 6.1 (E) None of these 56. A simple random sample of 25 postal service employees found that the average time these employees had worked for the postal service was 7 years with a standard deviation of 2 years. The distribution of the time all employees have worked for the postal service is approximately normal. At 5% significance level, are these data provide sufficient evidence to support the claim that the average time an employee worked for the postal service has decreased from 7.5 years (which was the average about 10 year ago)? What is the appropriate p-value (which of the following statements is true about the computed p-value)? (A) P-value < 0.01 (B) 0.01 SP-value < 0.05 (C) 0.05 p-value <0.1 (D) 0.15 p-value <0.25 (E) p-value 0.25 57. In a survey of 1002 people, 701 said that they voted in the recent presidential election (based on data from the ICR Research Group). Test the claim that the percent of people who say they voted is less than 61% (which was the proportion of people who actually did vote). What is the appropriate test statistic? (A) 5.81 (B) -5.81 (C) 6.19 (D) -6.19 (E) None of these 58. In a Gallup survey, 1087 randomly selected adults were asked "Do you have occasion to use alcoholic beverage such as liquor, wine, or beer, or are you a total abstainer?" 674 surveyed peopled said that they used alcoholic beverage. At 5% significance level, do data provide evidence to support that the majority (more than 50%) of all adults use alcoholic beverages? Which of the following is the appropriate decision and conclusion? (A) Reject H. Data provided evidence to support that the majority of all adults use alcoholic beverages (B) Reject H. Data did not provide evidence to support that the majority of all adults use alcoholic beverages (C) Do not reject H ail to reject H.). Data provided evidence to support that the majority of all adults use alcoholic beverages. (D) Do not reject H, (fail to reject H.). Data did not provide evidence to support that the majority of all adults use alcoholic beverages. (E) None of these