ch 8 and 9

Part 2: Two-Tail T test

H0 - The average Monthly income = 6200

Ha - The average Monthly Income does not = 6200

Sample Mean - 5502.763

test value - 6200

p-value - <.05

Decision - Reject the null hypothesis

conclusion - There is enough evidence to conclude that the average monthly income is much different $6200

Part 3: One-Tail Proportion Test

H0 - The attrition rate = .12

Ha - the attrition rate > .12

Question 3.1 - Sample Proportion = .161

Question 3.2 - One tail p value = 0

Question 3.3 = we reject the null hypothesis

Sample proportion - .12

There is enough evidence to conclude that attrition rate is greater than 12%

Chi Square test

H0 - Attrition and department are independent

Ha - attrition and department are dependent

Question 4.3 - we reject the nul hypothesis

There is enough evidence to conclude that attrition depends on department

Question 4.1 - Research and development

Question 4.2 - Chi Square = 10.796

df=2

p-value =.005

Q