Question #4 (use the following to solve a, b, c, and d that follow)
You want to compare the daily sales for two different designs of Web pages for your internet business.
You assign the next 62 days to either Design A or Design B, 31 days each. The summary statistics for the
test are shown in part (d) on the next page. Suppose Design A is the current design and Design B is a
proposed new design. The hypothesis is that Design B is superior to Design A.
a) Would you use a one-sided or two-sided test for this example. Why?
b) State the null and alternative hypothesis corresponding to your answer for (a).
c) What would the critical value be? Use α = 0.05
d) Suppose the following output is obtained from Excel. Conduct the significance test
corresponding to your answer to (b) above. What is the result of the significance test? SOLVE
AND INTERPRET CLEARLY AND THOROUGHLY.
A
Mean
Standard Error
Median
Standard Deviation
Sample Variance
Kurtosis
Skewness
Range
Minimum
Maximum
Sum
Count
B
1031.22
0.269679945
1025
77.58
6018.6564
-1.875
5.42776E-17
125
989.65
1200
30936.6
31 30
Mean
Standard Error
Median
Standard Deviation
Sample Variance
Kurtosis
Skewness
Range
Minimum
Maximum
Sum
Count
1085.34
0.269679945
1055
77.6
6021.76
-1.875
5.42776E-17
123
920.3
1199.56
32560.2
31 30
