1. (Previous exam question) Over the past 50 years, an average of 370 minor earth tremors a day has been recorded in Northern California. Recently, over a period of nine days, the following number of minor tremors were recorded: 386, 394, 362, 423, 456, 370, 385, 430, 400 a) Is there evidence for a recent increase in the number of tremors (a <.05)? b) Based on the 9-day data, form a 95% confidence interval to estimate the mean number of minor tremors that might be expected each day over the next several weeks.

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1. (Previous exam question) Over the past 50 years, an average of 370 minor earth tremors a day has been recorded in
Northern California. Recently, over a period of nine days, the following number of minor tremors were recorded:
386, 394, 362, 423, 456, 370, 385, 430, 400
a) Is there evidence for a recent increase in the number of tremors (a ≤.05)?
b) Based on the 9-day data, form a 95% confidence interval to estimate the mean number of minor tremors that
might be expected each day over the next several weeks.
Transcribed Image Text:1. (Previous exam question) Over the past 50 years, an average of 370 minor earth tremors a day has been recorded in Northern California. Recently, over a period of nine days, the following number of minor tremors were recorded: 386, 394, 362, 423, 456, 370, 385, 430, 400 a) Is there evidence for a recent increase in the number of tremors (a ≤.05)? b) Based on the 9-day data, form a 95% confidence interval to estimate the mean number of minor tremors that might be expected each day over the next several weeks.
Answers:
1.a) t = 3.033, reject Ho: there is evidence for a significant increase in the number of errors
1b) 377.35 to 423.99
Transcribed Image Text:Answers: 1.a) t = 3.033, reject Ho: there is evidence for a significant increase in the number of errors 1b) 377.35 to 423.99
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