# I need help with my homework. here is the problem locander et al.

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I need help with my homework. Here is the problem

Locander et al. also studied the accuracy of responses on questions involving more sensitive material than voter registration. From public records, individuals were identified as having been charged with drunken driving not less than 6 months or more than 12 months from the starting date of the study. Two random samples from this group were studied. In the first sample of 30 individuals, the respondents were asked in a face- to- face interview if they had been charged with drunken driving in the last 12 months. Of these 30 people interviewed face- to- face, 16 answered the question accurately. The second random sample consisted of 46 people who had been charged with drunken driving. During a telephone interview, 25 of these responded accurately to the question asking if they had been charged with drunken driving during the past 12 months. Assume that the samples are representative of all people recently charged with drunken driving.

( a) Let p1 represent the population proportion of all people with recent charges of drunken driving who respond accurately to a face- to- face interview asking if they have been charged with drunken driving during the past 12 months. Let p2 represent the population proportion of people who respond accurately to the same question when it is asked in a telephone interview. Find a 90% confidence interval for p1-p2

( b) Does the interval found in part ( a) contain numbers that are all positive? all negative? mixed? Comment on the meaning of the confidence interval in the context of this problem. At the 90% level, do you detect any differences in the proportion of accurate responses to the question from face- to- face inter-views as compared with the proportion of accurate responses from telephone interviews? ( c) Test the claim that there is a difference in the proportion of accurate responses from face- to- face interviews compared with the proportion of accurate responses from telephone interviews. Use a = 0.05

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