72) Express the confidence interval (0.432, 0.52) in the form of p± E. A) 0.432 ± 0.088 B) 0.432 + 0.044 C) 0.476 ± 0.088 D) 0.476 ± 0.044
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- Express the confidence interval 0.666 less than pless than 0.888 in the form Modifying Above p with caret plus or minus Upper E.Express the confidence interval (0.432,0.52) in the form of [p-hat] plus or equals [E]A smart phone manufacturer is interested in constructing a 90% confidence interval for the proportion of smart phones that break before the warranty expires. 90 of the 1595 randomly selected smart phones broke before the warranty expired. Round answers to 4 decimal places where possible. a. With 90% confidence the proportion of all smart phones that break before the warranty expires is between ? and ? b. If many groups of 1595 randomly selected smart phones are selected, then a different confidence interval would be produced for each group. About ?percent of these confidence intervals will contain the true population proportion of all smart phones that break before the warranty expires and about ? percent will not contain the true population proportion.
- Suppose that in a sample of 4876customers at a food store, 2654food shop more than once a week. Find a 90% confidence interval for the population proportion of customers who shop more than once a week. Interpret your answer. b) A claim is made that 52% of all customers at a food store shop more than once a week. Using the results from part (a) of this problem, would this claim be valid or invalid?4. From an SRS of 600 U.S. adults, 116 live in a multigenerational household (multiple generation under one roof). Which of the following is the 95% confidence interval of the population proportion of U.S. adults that live in a multigenerational household in the hat p pm ME( hat p ) formTwo brands of refrigerators, denoted A and B, are each guaranteed for 1 year. In a random sample of 50 refrigerators of brand A, 12 were observed to fail before the guarantee period ended. An independent random sample of 60 brand B refrigerators also revealed 12 failures during the guarantee period. Estimate the true difference (p1−p2) between proportions of failures during the guarantee period, with confidence coefficient approximately 0.98. (Round off to three decimals)
