Realtor Elaine Snyderman took a random sample of 12 homes in a prestigious suburb of Chicago and found the average appraised market value to be $780,000, and the standard deviation was $49,000. Test the hypothesis that for all homes in the area, the mean appraised value is $825,000 against the alternative that it is less than $825,000. Use the 0.05 level of significance.

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.