Question

Question 1:

A statistical program is recommended. A sales manager collected the following data on x = years of experience and y = annual sales ($1,000s). The estimated regression equation for these data is = 81 + 4x. Salesperson Years of Experience Annual Sales ($1,000s) 1 80 3 97 92 107 103 111 119 128 117 136

Question 2:

Answer 1

Solution:

Here we solve this problem using minitab statistical software.

now residuals are

Years of experience	Annual Sales	Residuals
1	80	-5
3	97	4
4	92	-5
4	107	10
6	103	-2
8	111	-2
10	119	-2
10	128	7
11	117	-8
13	136	3

And Years of experience   vs residuals  plot is 4

Therefore 4 number graph is correct answer

where x is Years of experience

Scatterplot of RESI1 vs x RESIT 0 2 4 6 8 10 12 14

Option 4 is correct

b)

option E is correct

The plot suggest a generally horizontal band of residual points indicating that the error term assumption appears reasonable.

Question:2

ans :

Therefore

Regression Equation

y = 2.53 + 0.62 x

now residual plot is

Scatterplot of RESI1 vs X RESI1

Option A is correct

i.e 1st graph is correct

now

The plot suggest a funnel pattern in the residual indicating that the error term assumption are not satisfied .

Thank You..!!