A company manager thinks he is overpaying for fertilizer at $174 per ton. To find out,...

A company manager thinks he is overpaying for fertilizer at $174 per ton. To find out, he collects fertilizer prices per ton from five distributors. Construct a 90% confidence interval from his results: 128, 140, 170, 166, and 156.

Expert Solution

We have for given data,


Sample mean =152
Sample standard deviation =15.85
Sample size =5
Level of significance=1-0.90=0.1
Degree of freedom =4

t critical value is (by using t table)=   2.132

Confidence interval formula is

=(136.89,167.11)

orchestra answered 3 years ago

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A company manager thinks he is overpaying for fertilizer at $174 per ton. To find out,...

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