Question

A study of a concrete trucking company involved randomly selecting a sample of 33 trucks that...

A study of a concrete trucking company involved randomly selecting a sample of 33 trucks that delivered concrete to projects around Brisbane. From this sample, it was found the average weight of concrete delivered per truck was 11.5 tonnes with a sample standard deviation of 0.8 tonnes. The upper limit of a 90% confidence interval for the true mean weight (in tonnes) of concrete delivered by a truck can be estimated to be ____________.

A.

11.740
B.

11.694
C.

11.729
D.

11.736
Math   Statistics-And-Probability   
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Answer #1

Refer t-table or use excel function "=T.INV.2T(0.10,32)" to find the value of t.

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