quiz%206D - Stat 119 Quiz 61 Name Red id Use the following...

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Unformatted text preview: Stat 119 Quiz 61) Name: Red id: Use the following to answer Questions 13: A 90% confidence interval for the proportion of drivers who change CDs while they are driving is (0.583, 0.657) 3. (2 points) What is the point estimate of the true proportion of drivers who change CD3 while driving? ’ “ _ i“ 2:: beta " Answer (l point) The margin of error for the confidence interval is: iggn ifigg a... to Answer a 3. (1 point) What is the best interpretation of the above interval? A. 90% of the time the true proportion of drivers who change CDs while driving will be within the interval. B. 90% of. the time the sample proportion of drivers who change CDs while driving will be within the interval. We are 90% confident that the true proportion of drivers who change CD3 while driving wiEl be within the interval. D. We are 90% confident that the sample proportion of drivers who change CD5 while driving will be within the interval. Use the foliowing information for problems 4-7 A A survey conducted at SDSU interviews a random sample of 229 female students and 167 g 2: i :3. admitted to dieting within the past 12 months. gfi 4. (3 points) Construct a 95% confidence interval for p, the population proportion of ferna e SDSU Students whO have bfiefl 01* . . sees a Mt 5. (1 point) Give a one-sentence interpretation of yur confiden e interval. h? its ii: an . sis fiefitt shofiii him a t. a a - I 6. (2 points) How many female students would we need to survey in order to reduce the margin of error to 0.02? a it t i t it 7. (1 point) Suppose the researcher decided that he wanted to obtain a shorter confidence interval than the one caicuiated above. This could be accompiished by: A. Using a lower level of confidence. M 13. Using a smaller sample size. K C. Using a higher love} of confide'aceg D. Both A) and B) Answer: Use the following information for probiems 8-9 An article in the Annals of the Association of American Geographers revealed that ooiy 116 of Bi? randomly seiected residences in Los Angeles County were protected by earthquake insurance. Do the data provide sufficient evidence to show that less than 40% of the residents of Los Angeles County are protected by earthquake insurance? Use a 0.05 level of significance. 8. (1 point) Gi __ e two assumptions that must be met in order for a hypothesis test to be valid 52%?g §@ 7 § 3 § 9. Condot a hypothesis test: 1. (2 points) State the nuli and alternative hypotheses. w agQ fig: §§3 gig ll. (2 points) Calculate the test statistic. gag héghe ‘Q_ We... III. (2 points) Calculate the corresponding pwvalue. WQWz: ?{%€ém itgg 1'; ...
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quiz%206D - Stat 119 Quiz 61 Name Red id Use the following...

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