SOLUTION: It is know 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

Question 864697: It is know 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 of estimate of the mean for this group is _________ and the 99% confidence interval for this group is_________.
A. 100; (97.27; 102.73)
B. 102 ;(97.27 ; 102.73)
C. 100 ; (99.27 ; 104.73)
D. 102; (99.27 ; 104.73)
It is know 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 of 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)
D. 102 ; (98.26 ; 101.74)

Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi

ME = 2.576*15/sqrt(200) = 2.73

CI: 102-2.73 < u <  102 + 2.73

B. 102 ;(97.27 ; 102.73)



ME = 1.645*15/sqrt(200) = 1.74

CI: 102-1.74 < u <  102 + 1.74

B. 102 ; (100.26 ; 103.74)



CI	z

90%	z =1.645

92%	z = 1.751

95%	z = 1.96

98%	z = 2.326

99%	z = 2.576



 

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