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-You are doing a project on how much time (in hours) it takes

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-You are doing a project on how much time (in hours) it takes people to adjust after traveling to a new time zone. You know that the population standard deviation is 30 but you’re not sure what the population mean time is. You take a sample of 100 individuals and find a sample mean of 19 hours. What is the 90% confidence interval for the true population mean? Round to two decimal places.A.None of the answers given is correctB.17.11-20.89 hoursC.14.07-23.94 hoursD.16.99-22.01 hours2.Your colleague is looking into the typical amount of stress that people are feeling over the COVID-19 pandemic. In a sample of 81 people, he finds a mean stress level of 69, on a scale of 0 to 100. He knows that the population standard deviation for stress scores is 12. Calculate the margin of error for a 99% confidence interval of the true population mean stress score.A.1.33B.12.92C.3.43D.2.66Please help me with both and thank you

8. A hypothesis test is executed with an alpha = 10% and Ho is rejected.

Question 8. A hypothesis test is executed with an alpha = 10% and Ho is rejected. Using the probability model (or frequentist) view of probability discussed in class, what is the probability that the statistical conclusion is wrong? If we executed the same hypothesis test (with an alpha of 10%) on different random samples of data 10,000 times, approximately how many times would it make the mistake of rejecting Ho when Ho is actually true in the population? Your answer should be an integer

How to solve question 8c? If we assume the population standard deviation,

Question How to solve question 8c? If we assume the population standard deviation, for the length of person’s full name to be 10.7. Determine the minimum sample size, n, needed to construct a 82% confidence interval for the population mean length to be have width of 4 letters.

The mean weekly sales per employee at a nationwide store is normally distributed

Question The mean weekly sales per employee at a nationwide store is normally distributed with a mean of \$7,300 per week and a standard deviation of \$700. What is theprobability that a randomly selected employee will have sales less than \$6,500?Select one

ou are testing the claim that the mean GPA of night students is less than

Question ou are testing the claim that the mean GPA of night students is less than the mean GPA of day students. You sample 25 night students, and the sample mean GPA is 2.74 with a standard deviation of 0.54You sample 30 day students, and the sample mean GPA is 2.54 with a standard deviation of 0.76

(need to use Minitab express/ I want to know to reach answers step by step)

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