statistics

It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the 90% confidence interval for this group is ____________________.
a. 100; (100.26; 103.74)
b. 102; (100.26; 103.74)
c. 100; (98.26; 101.74)

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  1. 90% confidence interval leaves .05 on each side. Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.05) and its Z score.

    90% = mean ± 1.645 SEm

    SEm = SD/√n

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