Question 974224
The recommended number of hours of sleep per night is 8 hours, but everybody "knows" that the average college student sleeps less than 7 hours. The number of hours slept last night by 10 randomly selected college students is listed below.
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Complete the following hypothesis test using α = 0.05    : 
Ho: μ = 7
Ha: &#956; < 7 

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 DATA:
8	6.9	6.1	6.6	7.5	8	7.6	7.3	7.8	5.7
x-bar = 7.15
s = 0.8
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(a) Find t. (Give your answer correct to two decimal places.)
t(7.15) = (7.15-7)/0.8 = 0.15/0.8 = 0.19
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(ii) Find the p-value. (Give your answer correct to four decimal places.)
p-value = P(t < 0.19 when df = 9) = tcdf(-100,0.19,9) = 0.58
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Conclusion:: Since the p-value is greater than alpha, fail to 
reject Ho.
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Cheers,
Stan H.
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