An article gave the following observations on maximum concrete pressure (kN/m2).

Question

An article gave the following observations on maximum concrete pressure (kN/m2). 33.3 41.9 37.4 40.3 36.7 39.2 36.3 41.8 36.0 35.3 36.7 38.9 35.8 35.2 40.2 (a) Is it plausible that this sample was selected from a normal population distribution? O Using a normal probability plot, we ascertain that it is plausible that this sample was taken from a normal population distribution. O Using a normal probability plot, we ascertain that it is not plausible that this sample was taken from a normal population distribution. O Because of the number of observations, we ascertain that it is not plausible that this sample was taken from a normal population distribution. O Because of the number of observations, we ascertain that it is plausible that this sample was taken from a normal population distribution. (b) Calculate an upper confidence bound with confidence level 95% for the population standard deviation of maximum pressure. (Round your answer to three decimal places.)

Explanation / Answer

Mean =  37.67

StDev = 2.58

SE Mean = 0.666

Standard error of the mean = SEM = S/N = 0.666

t(, N-1) = 2.145

Confidence interval = m +/- (t(, N-1)*SEM)

Mean = 37.667

Lower bound: 36.238

Upper bound: 39.095

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