1. Construct a 95% confidence intervalaround the population mean. Report the mar- gin of error, along with the upper and lowerbounds. Interpret the confidence intervalin the context of thequestion.

ME=

Xupper =

Xlower =

1. What is the effect on the width of the confidence intervalif wedecrease thesample size?
2. A study wantsto determine if cell phone bills are higher than $100. Specify the null and alternative hypothesis for this particulartest.

H₀:

H_a:

1. Reporttheteststatistic andp-valuefromthistest and interpretthesevalues. Let

=.01. What is the result from the test?Explain.