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Suppose that BC financial aid alots a textbook stipend by claiming that the average textbook at BC bookstore costs $ 93.55. YThe null hypothesis in words would be: The average of price of all textbooks from the store is less than $ 93.55. The averageBased on a sample of 80 textbooks at the store, you find an average of 100.55 and a standard deviation of 18.4. The point est

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Answer #1

#1.
Below are the null and alternative Hypothesis,
Null Hypothesis: μ = 93.55
Alternative Hypothesis: μ ≠ 93.55

Option A

#2.
In words: Option B


#3.
point estimate is 100.550

#4
Given CI level is 90%, hence α = 1 - 0.9 = 0.1
α/2 = 0.1/2 = 0.05, Zc = Z(α/2) = 1.64

CI = (xbar - Zc * s/sqrt(n) , xbar + Zc * s/sqrt(n))
CI = (100.55 - 1.64 * 18.4/sqrt(80) , 100.55 + 1.64 * 18.4/sqrt(80))
CI = (97.176 , 103.924)

97.176 to 103.924

#5.
Reject the null hypothesis

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