A university dean of students wishes to estimate the average number of hours students spends doing homework per week. The standard deviation from a previous study is 6.2 hours. How large a sample must be selected if he wants 99% Confidence Interval of finding when the true mean differs from the sample mean 1.5 hours?

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Jessetomay7id Jessetomay7id · Answer 1

Answer:

• Standard deviation,

Standard deviation, σ

Standard deviation, σ=

Standard deviation, σ=6.2

• Level of significamce,

Level of significamce, α

Level of significamce, α=

Level of significamce, α=0.01

•Margin of error,

Margin of error, M

Margin of error, ME

Margin of error, ME=

Margin of error, ME=1.5

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