7. The mean work week for engineers in a start-up company is believed to be about 60 hours. A newly hired engineer hopes that it's shorter. She asks ten engineering friends in start-ups for the lengths of their mean work weeks. Based on the results that follow, should she count on the mean work week to be shorter than 60 hours? Data (length of mean work week): 70; 45; 55; 60; 65; 55; 55; 60; 50; 55. a) Input the data into a list and find the mean and standard deviation. x? : Sx : b) Conduct a test at a significance level of 0.05. H0 : Ha : Calculator: Results:
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Mean (XĢ) = (70 + 45 + 55 + 60 + 65 + 55 + 55 + 60 + 50 + 55) / 10 = 570 / 10 = 57 Now, let's find the standard deviation (Sx): Show moreā¦
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