Question: 9. Construct a 90% confidence interval estimate for the population average time spent on preparation. Interpret the interval 10. Test the hypothesis that population average

9. Construct a 90% confidence interval estimate for the population average time spent on preparation. Interpret the interval

10. Test the hypothesis that population average time spent on preparation is more than 65 hours using a 5% level of significance

Should i use the t test or z test to calculate these 2? i know all the means, standard variation, etc, correlation

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