Q1.Computers Sales: The following table gives the experience (in years) and the number of computers sold during the previous three months by seven sales persons:

Experience

4

12

9

6

10

16

7

Computer sold

19

42

28

33

40

37

23

(a)Compute r & r² and explain what they mean.

(b)Calculate probable error.

(c)Plot a scatter diagram for the above data.

(d)Find the least square regression line. Predict the number of computers sold during the past three months by a salesperson with 11 years of experience.

Q2). House Work: A study of time spends on housework found that men who are employed spend an average of 8.2 hours per week doing housework. Assume that the amount of time spend on housework per week by all employed men in the United States is normallydistributed with a mean of 8.2 hours and a standard deviation of2.1 hours. Find the probability that:

a.A randomly selected employed men spends 8 or less hours per week on housework?

b.A randomly selected employed men spends between 6 and 10 hours per week on housework?

c.A randomly selected employed men spends 9.2 or more hours per week on housework?

d.The x value that has 25% of the area above it

IMPORTANT NOTE:

DEAR TEACHER,

i)MAKE SURE YOU WRITE THE FORMULA OF THIS QUESTION IN EACH PART AND PLEASE SOLVE STEP BY STEP WHICH WILL HELP ME TO UNDERSTAND IT EASY

II) PLEASE SOLVE ALL THE PARTS IN A VERY SIMPLE WAY