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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.

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.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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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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