Question 138548
A sample of 25 households in Prolific City revealed a mean of 7.5 residing members and a standard deviation of 3. If the mean household size for the nation is 4.2, what is the value of the test statistic?
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test statistic = t*[3/sqrt(25)]
Assuming a 2-tail test with alpha = 5% you get:
ts = 2.064[3/5] = 1.2384
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Cheers,
Stan H.