In a recent study, researchers were interested in the distractions caused by cell phones. In a random sample of 738 cell phone users, approximately 23 percent of the sampled users admitted to walking into something while talking on their cell phones. 1. Calculate the standard error of the sample proportion of the sampled users who admitted to walking into something while talking on their cell phones. 2. Construct and interpret a 95 percent confidence interval for the population proportion of cell phone users who will admit to walking into something while talking on their cell phones.

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Q: What is the impact on the confidence interval estimate if a larger sample is used?

A: Confidence interval:

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Q: In a four-year psychedelic-mushroom experiment, 93 of the 300 subjects reported experiencing “strong…

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A: mean = 47 s = 11 n = 75

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Q: In a survey of 3299 adults aged 57 through 85​ years, it was found that 82.2​% of them used at least…

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