Solved: The article “Concrete Pressure on Formwork” (Mag.

Chapter 7, Problem 46E

(choose chapter or problem)

The article “Concrete Pressure on Formwork” (Mag. of Concrete Res., 2009: 407–417) gave the following observations on maximum concrete pressure \((kN/m^2 )\):

33.2     41.8     37.3     40.2     36.7     39.1     36.2     41.8

36.0      35.2     36.7     38.9     35.8     35.2     40.1

a. Is it plausible that this sample was selected from a normal population distribution?

b. Calculate an upper confidence bound with confidence level 95% for the population standard deviation of maximum pressure.

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