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Mathematics, 08.04.2020 05:53 nickp1233
1). A class survey in a large class for first-year college students asked, "About how many hours do you study in a typical week?". The mean response of the 432 students was x¯¯¯ = 15 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation 8 hours in the population of all first-year students at this university.
What is the 99% confidence interval (±0.001) for the population mean?
Confidence interval is from _ to _ hours.
2). We have the survey data on the body mass index (BMI) of 650 young women. The mean BMI in the sample was x¯¯¯=26.5. We treated these data as an SRS from a Normally distributed population with standard deviation σ=7.
Find the margins of error for 99% confidence based on SRSs of N young women.
N margins of error (±0.0001)
106 ?
380 ?
1597 ?
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