In a law office, the average number of billed hours per day was 146 last year. In the first 71 days of this year, the average number of billed hours per day is 157 with a standard deviation of 52 hours. When testing the hypothesis (at the 10% level of signficance) that the average number of billed hours per day has increased, what test statistic? (please round your answer to 2 decimal places)

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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In a law office, the average number of billed hours per day was 146 last year. In the first 71 days of this year, the average number of billed hours per day is 157 with a standard deviation of 52 hours. When testing the hypothesis (at the 10% level of signficance) that the average number of billed hours per day has increased, what test statistic? (please round your answer to 2 decimal places)
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Denote μ as the true average number of hours billed per day this year.

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