The owner of Muyu company, which publishes computer books, wants to know whether
ID: 3057743 • Letter: T
Question
The owner of Muyu company, which publishes computer books, wants to know whether the position of the books in the computer book section of bookstores influences sales. More specifically, does it really matter whether the books are placed in the front, back or middle of the computer book section? The resulting sales are shown on the table below:
FRONT
BACK
MIDDLE
7
12
10
10
13
11
8
15
12
9
16
11
a) What is the null and alternative hypothesis for the numbers 1.75, 4.77 and 2.51 under Tukey’s simultaneous comparisons?
b) Can we conclude that the mean sales of front and middle differ at 99% confidence?
c) Can we conclude that the mean sales of back and front differ at 99% confidence?
d) Can we conclude that the mean sales of back and middle differ at 99% confidence?
e) Are the conclusions reached in parts b-d(Q2) simultaneous or individual? (Meaning: Can I say that the answer to parts b-d holds simultaneously? )
FRONT
BACK
MIDDLE
7
12
10
10
13
11
8
15
12
9
16
11
Explanation / Answer
The owner of Muyu company, which publishes computer books, wants to know whether the position of the books in the computer book section of bookstores influences sales. More specifically, does it really matter whether the books are placed in the front, back or middle of the computer book section? The resulting sales are shown on the table below:
FRONT
BACK
MIDDLE
7
12
10
10
13
11
8
15
12
9
16
11
a) What is the null and alternative hypothesis for the numbers 1.75, 4.77 and 2.51 under Tukey’s simultaneous comparisons?
b) Can we conclude that the mean sales of front and middle differ at 99% confidence?
c) Can we conclude that the mean sales of back and front differ at 99% confidence?
d) Can we conclude that the mean sales of back and middle differ at 99% confidence?
e) Are the conclusions reached in parts b-d(Q2) simultaneous or individual? (Meaning: Can I say that the answer to parts b-d holds simultaneously? )
FRONT
BACK
MIDDLE
7
12
10
10
13
11
8
15
12
9
16
11
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