Question

IN SAS NOT ALGEBRA OR MINITAB OR R, SO ON. Please type up the SAS CODE. Thanks.

Question 4: A company wanted to know if attending a course on “how to be a successful salesperson” can increase the average sales of its employees. The company sent six of its salesperson to attend this course. The following table gives the one week salts of these salespersons before and after they attended the course. Before 12 18 25 9 14 16 16 After 18 24 24 | 14 14 19 20 Using the 1% significance level, can you conclude that the mean weekly sales for all salespersons increase as a result of attending this course?

Answer 1

SAS CODE:

data sales;
infile cards;
input before after;
cards;
12 18
18 24
25 24
9 14
14 19
16 20
;
run;
proc ttest data=sales;
paired before*after;
run;

Output

The TTEST Procedure

Difference: before - after

N	Mean	Std Dev	Std Err	Minimum	Maximum
6	-4.1667	2.6394	1.0775	-6.0000	1.0000

Mean	95% CL Mean		Std Dev	95% CL Std Dev
-4.1667	-6.9366	-1.3967	2.6394	1.6476	6.4735

DF	t Value	Pr > |t|
5	-3.87	0.0118

Distribution of Difference: before - after With 95% Confidence Interval for Mean Normal Kernel Percent 0 95% Confidence Difference

t=-3.87

p=0.0118--this is two tail p value as we get two tail test results in pairedt test

one tail p value =p=0.0118/2= 0.0059

p<0.01

Reject null hypothesis

accept alternative hypothesis

Can conlcude that mean weakly sales for all salespersons increase as a result of attending this course