Question

A supermarket manager is trying to decide how many checkout registers to keep open during the...

A supermarket manager is trying to decide how many checkout registers to keep open during the early-morning hours. To aid her analysis, she recorded the number of customers who came to the supermarket during the early morning hours for the past 30 days. The data collected is presented in the table below. Construct a 95% confidence interval for the mean number of early-morning customers in the supermarket.

Day

Number of early-morning customers

Day

Number of early-morning customers

1

167

16

147

2

172

17

164

3

150

18

168

4

178

19

154

5

160

20

187

6

164

21

169

7

167

22

152

8

140

23

167

9

190

24

145

10

150

25

188

11

148

26

154

12

149

27

187

13

148

28

149

14

189

29

178

15

165

30

145

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