Addicted to the Internet?

The Ann Arbor public school officials would like to estimate the population mean daily Internet usage time for all Ann Arbor teens. To do so, a large random sample of Ann Arbor teens was selected. Here are the results of their study.

The 95% confidence interval for the mean daily internet usage time for the population of all such Ann Arbor teens was found to be (6.7 hours, 9.3 hours).

The 99% confidence interval or the mean daily internet usage time for the population of all such Ann Arbor teens was found to be (6.257 hours, 9.743 hours).

The Ann Arbor public school officials know that you have some statistical background and would like your opinion. Please read each statement carefully and share with us your opinion.

Increasing the confidence level from 95% to 99% increases the margin of error which in turn decreased the lower limit and increased the upper limit of the 99% confidence interval.

Step-by-step explanation:

95% confidence interval is (6.7 hours, 9.3 hours)

Margin of error = (9.3-6.7)/2 = 1.3 hours

99% confidence interval is (6.257 hours, 9.743 hours)

Margin of error = (9.743-6.257)/2 = 1.743 hours

The margin of error increased because as the confidence level increases, the critical value (t) also increases.

Increasing the margin of error invariably would decrease the lower limit of the mean and increase the upper limit.

step-by-step explanation:

ddd

the median here is 25. your lowest value is 14 and highest value is 48. to find the third quartile, find the medium number in between 25 and 48 which would be 42 i believe.