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An economics professor is interested in seeing if the mean hours worked by students in a...

An economics professor is interested in seeing if the mean hours worked by students in a week at part time or full time jobs (including work study) is greater than 10. To accomplish this, the professor randomly selected 240 students from the university. It was found that the distribution was right skewed and unimodal. The mean was 8 hours with a standard deviation of 4. The professor then did a hypothesis test.

Please find the test statistic for this hypothesis test

7.745

-7.745

3.872

-3.872

Math   Statistics-And-Probability   
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Answer #1

this is the right tailed test .  

The null and alternative hypothesis is ,

H0 :   = 10

Ha : > 10

Test statistic = z

= ( - ) / / n

= (8-10) / 4 / 240

= -7.745

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