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Wewaii [24]
3 years ago
8

A new version of SAT is given to 1000 randomly selected high school seniors. Thesample mean test score is 1110, and the sample s

tandard deviation is 123. Constructa 95% confidence interval for the population mean test score for high school seniors.
Business
1 answer:
SVEN [57.7K]3 years ago
8 0

Answer: (1108.49 ; 1111.56)

Explanation:

confidence interval.

Sample mean (S) = 1110

Sample Size (N) = 1000

standard deviation (sd) = 123

confidence α= 1 - 0.95 = 0.05/2 = 0.025

Z distribution table

Zα= Z(0.025) = 0.4013

confidence interval

(S - Zα.×Sd/\sqrt{N} ; S + Zα.×Sd/\sqrt{N})

(1110 - 0.4013×(123/\sqrt{1000}) ; 1110 + 0.4013×(123/\sqrt{1000})

(1108.491029 ; 1111.5608970091)

(1108.49 ; 1111.56)

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Suppose you know a company's stock currently sells for $90 per share and the required return on the stock is 8 percent. You also
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