2. It is known that the amount of time needed to change the oil on a car is normally distributed with a standard deviation of 5 minutes. A random sample of 14 cars was taken and the time taken to change the oil are measured as in Table 1. Table 1 41 72 81 87 33 58 60 69 71 108 72 72 91 82 (i) Identify the variable involved. (ii) Find a 99% confidence interval for average time taken to change the oil on cars. Give comment on the parameter estimate. (iii) Identify the estimator used in (ii). (iv) Calculate the estimation error of the confidence interval in (ii). (v) What is the effect of estimation error calculated in (iv) if the sample size increases?

Q: 16. Find mBC 240 D

A:

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Q: 3x 14)

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Statements and Logic

Logic is the analysis of general patterns of thoughts without regard to any specific sense of context.