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13) A recent survey found that 70% of all adults over 50 wear glasses for driving. In a random 13) sample of 70 adults over 50. what is the mean and standard deviation of the number who wear glasses? 14) The scores on a standardized test are reported by the testing agency to have a mean of 70. 14) Based on his personal observations, a school guidance counselor believes the mean score is much higher. He collects the following scores from a sample of 50 randomly chosen students who took the test. 39 48 55 63 66 68 68 69 70 71 71 71 73 74 76 76 76 77 78 79 79 79 79 80 80 82 83 83 83 85 85 86 86 88 88 88 88 89 89 89 90 91 92 92 93 95 96 97 97 99 Use the data to conduct a test of hypotheses at a = .05 to determine whether there is any evidence to support the counselor's suspicions. 15) The data below show the age and favorite type of music of 779 randomly selected people. 15) Test the claim that age and preferred music type are independent. Use a = 0.05. Country Rock Pop Classical 21 30 68 55 42 48 30 40 65 47 31 57 40 50 60 39 25 53 11) In a study of feeding behavior, zoologists recorded the number of grunts of a warthog 11) feeding by a lake in the 15 minute period following the addition of food. The data showing the number of grunts and and the age of the warthog (in days) are listed below: Number of Grunts Age (days) 90 125 68 141 39 155 44 160 63 167 40 174 62 183 17 189 20 195 Find and interpret the value of r. 12) Each year advertisers spend billions of dollars purchasing commercial time on network 12) television. In the first 6 months of one year, advertisers spent $1.1 billion. Who were the largest spenders? In a recent article, the top 10 leading spenders and how much each spent (in million of dollars) were listed: Company A $72 Company B 63.6 Company C 57.3 Company D 54 Company E 31.1 Company F $27.3 Company G 25 Company H 23.8 Company I 23.1 CompanyJ 19.2 Calculate the sample variance