Question: q1: looking for assistance 7 Problem #1 - In a manufacturing process a random sample of 25 bolts has a mean bolt length of 10

q1: looking for assistance

7 Problem #1 - In a manufacturing process a random sample of 25 bolts has a mean bolt length of 10 inches with a 7 variance of .25 inches. Provide direct responses to Parts A - D below, being sure to show the computations required for Parts B and C 7 in the spaces below each. : Part A - Should the researcher use t or z to compute this interval? Why so? (5 pts.) : Part B - Compute the 95% confidence interval for the true mean length of the bolts in the overall population. (15 pts.) : Part C - Compute the 99% confidence interval for the true mean length of the bolts in the overall population. (15 pts.) :Part D - Weeks after you have completed the analysis required above, a person on the factory floor makes a comment suggesting that the population average bolt length is above 10.4 inches. You think he is mistaken. How sure are you that he has made an error? 7 Explain to him, in everyday English, why your opinion is so strong. (15 pts.)

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