With individual lines at the checkouts, a store manager finds that the standard deviation for the waiting times on Monday mornings is 5.2 minutes.
After switching to a single waiting line, he finds that for a random sample of 29 customers, the waiting times have a standard deviation of 4.2 minutes. Use a 0.025 significance level to test the claim that with a single line, waiting times vary less than with individual lines.
Question 2
When a fair coin is flipped 10 times, the probability distribution of the number of tails, x, is as shown in the table. If Sue flips a coin 10 times and gets 9 tails, does that suggest that the coin is not fair?
x P(x)
0 0.001
1 0.010
2 0.044
3 0.117
4 0.205
5 0.246
6 0.205
7 0.117
8 0.044
9 0.010
10 0.001
A) Yes B) No
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