A random sample of 47 electrical engineers is used to estimate the average salary of all electrical engineers. The average salary of the sample is $91,000 with a standard deviation of $50,000. Compute a 95% confidence interval for the average salary of all electrical engineers. ($76,319.45, $105,680.55) O ($80,290.11, $120,800.34) ($55,281.79, $150,000.01) ($76,705.49, $105,294.51)

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A: Point estimate=0.81

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A:

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A: Givenn1=800x1=240n2=800x2=160p1^=x1n1=240800=0.3p2^=x2n2=160800=0.2α=1-0.95=0.05α2=0.025zα2=1.96

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A: Solution-:

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A: (d)

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Q: What would answer be at 99% confidence interval?

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