1.Compute a 95% confidence interval for the population mean, based on the sample numbers 21, 28, 33,34,25,26, and 135.

Find the lower and upper limits of the interval.

A. Lower-15.449; Upper-67.174

B. Lower-20.492; Upper- 40.876

C. Lower-18.925; Upper- 50.741

D. Lower-5.449; Upper-80.837

2.change the last value to 27 and re-compute the confidence interval. The numbers now are: 21, 28, 33, 34, 25, 26, and 27

A. Lower- 3.52; Upper- 41.929

B. Lower- 23.52; Upper- 31.909

C. Lower- 22.32; Upper- 50.741

D. Lower- 5.449; Upper- 80.837

3.What is an outlier and how does it affect the confidence interval?

A. An outlier stretches the interval because it increases the standard deviation

B. An outlier compacts the interval because it increases the standard deviation

C. An outliner stretches the interval because it decreases the standard deviation

D. An outlier compacts the interval because it decreases the standard deviation