The owner of a cell phone store at Greenhill's Shopping Center was not happy when he learned that the average number of cell phones sold daily was only 8 mobile phones. He hired a new seller and told him to tally the daily sales for 20 days. The following are the number of cell phones sold for the past 20 days. 9 9 19 8 19 11 12 12 16 10 12 8. 11 17 18 15 14 17 14 Do the collected data present sufficient evidence to indicate that the average number of cell phones sold daily has increased? Use 0.05 level of significance. Assume normality in the population.

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The owner of a cell phone store at Greenhill's Shopping Center was not happy when he learned
that the average number of cell phones sold daily was only 8 mobile phones. He hired a new
seller and told him to tally the daily sales for 20 days. The following are the number of cell
phones sold for the past 20 days.
19
9
9
8
9
19
11
12
12
16
10
12
8
11
17
18
15
14
17
14
Do the collected data present sufficient evidence to indicate that the average number of cell
phones sold daily has increased? Use 0.05 level of significance. Assume normality in the
population.
Transcribed Image Text:The owner of a cell phone store at Greenhill's Shopping Center was not happy when he learned that the average number of cell phones sold daily was only 8 mobile phones. He hired a new seller and told him to tally the daily sales for 20 days. The following are the number of cell phones sold for the past 20 days. 19 9 9 8 9 19 11 12 12 16 10 12 8 11 17 18 15 14 17 14 Do the collected data present sufficient evidence to indicate that the average number of cell phones sold daily has increased? Use 0.05 level of significance. Assume normality in the population.
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