1. Calculate the margin of error and construct the confidence interval for the population mean (you may assume the population data is normally distributed):

Standard Normal Distribution Table

a. x=99.4,n=70,=1.25,=0.1x=99.4,=70,=1.25,=0.1 E==

Round to 3 significant digits

< << <

Round to 2 decimal places

b. x=51.3,n=96,=12.6,=0.05x=51.3,=96,=12.6,=0.05 E==

Round to 3 significant digits

< << <

Round to 2 decimal places

2. Calculate the margin of error and construct the confidence interval for the population mean using the Student's t-distribution (you may assume the population data is normally distributed).

T-Distribution Table

a. x=83,n=66,s=17,x=83,=66,=17, 98% confidence

E==

Round to two decimal places if necessary

<<<<

Round to two decimal places if necessary

b. x=32.4,n=44,s=18.8,x=32.4,=44,=18.8, 98% confidence

E==

Round to two decimal places if necessary

<<<<

Round to two decimal places if necessary

3. Calculate the margin of error and construct a confidence interval for the population proportion using the normal approximation to the pp-distribution (if it is appropriate to do so).

Standard Normal Distribution Table

a. p=0.75,n=180,=0.05p=0.75,=180,=0.05

E==

Round to four decimal places if necessary

Enter 0 if normal approximation cannot be used

Round to four decimal places if necessary

Enter 0 if normal approximation cannot be used

b. p=0.35,n=120,=0.02p=0.35,=120,=0.02

E==

Round to four decimal places if necessary

Enter 0 if normal approximation cannot be used

Round to four decimal places if necessary

Enter 0 if normal approximation cannot be used