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?
The z-values are taken from standard normal table.
[Here, we have assigned z instead of . ]
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