PROBLEM 1 (14 points):

Do the students of PS193 and the students of PS194 miss in average the same amount of school days?

Test at .01 significance level.

PS 193 students : Average number of days absent = 15; standard deviation = 5.0; n = 100; PS194students:Average number of days absent = 14; standard deviation = 4.0; n =80;

PROBLEM 2 (14points):

The following data represents employees' attendance grouped into a sample of smokers and a sample ofnon-smokers.

Are these attendances equal at a .02 significance level?

Smokers: Average number of days absent=12; standard deviation = 3.0; n = 60 Non-Smokers: Average number of days absent=10; standard deviation = 4.0; n =40;

PROBLEM 3 (14 points):

Are the machine tools manufactured by Company X and Y (statistically) different with regard to how long they last?

Company X Company Y

17 weeks 18 weeks

.4 weeks .4 weeks

80 80

Test at alpha = .05

PROBLEM 4 (14 points):

Take-Home Pay. Is there a difference between the weekly earnings of married people compared to the ones for unmarried?

Married Not Married

X $540.60 $588.20

s $60 $80

n 45 55

Test at = .1

I need the answers to be typed and not handwritten, please. It's hard to understand people's writing. Don't Copy FROM CHEGG. I need genuine help thank you.