The information below is a summary of the duration of time in minutes that a random sample of customers spend drinking coffee on a Friday evening. The cafe manager thinks the average time taken by the customers to finish a cup of coffee is more than 15 minutes. Is the manager supported by these data? Use a = 0.05. Assume the variable is normally distributed. number of values mean (a) standard deviation (s) 1.76 12 15.65

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The information below is a summary of the duration of time in minutes that a random
sample of customers spend drinking coffee on a Friday evening. The cafe manager thinks
the average time taken by the customers to finish a cup of coffee is more than 15
minutes. Is the manager supported by these data? Use a
0.05. Assume the variable is
normally distributed.
on
number of values
mean (a)
standard deviation (s)
1.76
12
15.65
Transcribed Image Text:Time left 0:49:41 The information below is a summary of the duration of time in minutes that a random sample of customers spend drinking coffee on a Friday evening. The cafe manager thinks the average time taken by the customers to finish a cup of coffee is more than 15 minutes. Is the manager supported by these data? Use a 0.05. Assume the variable is normally distributed. on number of values mean (a) standard deviation (s) 1.76 12 15.65
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