Question 1
A random sample of 250 students at a university finds that these students take a mean of 15.3 credit hours per quarter with a standard deviation of 1.6 credit hours. Estimate the mean credit hours taken by a student each quarter using a 95% confidence interval. Round to the nearest thousandth.
◦ 15.3 ± .157
◦ 15.3 ± .010
◦ 15.3 ± .198
◦ 15.3 ± .013
Question 2
A random sample of 250 students at a university finds that these students take a mean of 14.3 credit hours per quarter with a standard deviation of 1.7 credit hours. The 95% confidence interval for the mean is
Interpret the interval.
◦ We are 95% confident that the average number of credit hours per quarter of students at the university falls in the interval 14.089 to 14.511 hours.
◦ The probability that a student takes 14.089 to 14.511 credit hours in a quarter is
◦ We are 95% confident that the average number of credit hours per quarter of the sampled students falls in the interval 14.089 to 14.511 hours.
◦ 95% of the students take between 14.089 to 14.511 credit hours per quarter.
John Hopkins University
Random
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