Question

in a simple random sample of 190 households, the sample mean number of personal computers was 2.78. assume the population standard deviation is 0.41.
a) a 99.8% confidence interval for the mean number of personal computers is ----< mean <-----
2) a simple random sample of eight college freshman were asked about how many hours of sleep they typically got per night. the results were
7.5, 8, 6.5, 24, 8.5, 6.5, 7, 7.5
a) the data contains an outlier that is clearly a mistake. eliminate the outlier, then construct an 80% confidence interval for the mean amount of sleep from the remaining values. round the answer to at least two decimal places.
an 80% confidence interval for the mean amount of sleep from the remaining values is ----< mean <------

3) according to the us census bereau, 34% of men who worked at home were college graduates. In a sample of 500 women who worked at home, 170 were college graduates.
a) find a point estimate for the proportion of college graduates among women who work at home. round your answer to at least three decimal places.
the point estimate for the proportion of college graduates among women who work at home is:

4) a college admissions officer sampled 127 entering freshman and found that 40 of them scored less than 500 on the math SAT. round to at least three decimal places.
a) the point estimate for the proportion of all entering freshman at this college who scored less than 500 on the math SAT is:

Answer 1

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