Question

A survey is conducted with 25 families on the grocery budget of families and it’s determined...

A survey is conducted with 25 families on the grocery budget of families and it’s determined the mean budget is 452$ with a standard deviation of 95$.

a) Find a 95% confidence interval of grocery budgets.

b) Find a 99% confidence interval of grocery budgets.

c) Which interval is larger? Why is that?

Math   Statistics-And-Probability   
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Answer #1

The z-values are taken from standard normal table.

[Here, we have assigned z instead of . ]

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