Problem # 1: proper statistical testing to conclude if Is there is a difference among population proportions. 5% level of significance ( = .05).

# 1#2#3

171820

182126

252833

293628

Problem # 2: Use ANOVA method to determine if there is a statistical differences among population means. Show all the work. ( = .01).

Group 1Group 2Group 3

282655

353462

422744

233254

504160

Problem # 3: For the following Dependent and independent variables, complete simple regression analysis to find the following. Explain them in detail. ( = .05).

Quantity (X)Cost (Y)

1255

1148

1366

1472

1780

a) Predict cost where quantity = 25

b) Determine standard error of estimate?

c) Interpret slope and intercept

d) Find R^2 and R, interpret their values.

e) Is there any correlation between Quantity and Cost

f) Set up a 95% Confidence Interval Estimate for the predicted Cost (Y^)