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2. (TCO 11)  A restaurant claims that its speed of service time is less than 18 minutes. A random selection
of 36 service times was collected, and their mean was calculated to be 17.1 minutes. Their standard
deviation is 3.1 minutes. Is there enough evidence to support the claim at alpha = .08. Perform an
appropriate hypothesis test, showing each important step. (Note: 1st Step: Write Ho and Ha
Determine Rejection Region
()
),18:18),0.08)1.7511.75117.118)1.53.1/6)1.51.751,1.751,
iNullhypothesisAlternativehypothesisiisignificanceleveliiirejectthenullhypothesisifzorgreaterthanzivzvAszisliesinsowecannotreje
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=
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Err:520
Err:520
A restaurant claims that its speed of service time is less than 18 minutes is WrongthenullhypothesisInotherword
4. (TCO 1,7) A social service worker wants to estimate the true proportion of pregnant teenagers who miss
at least one day of school per week on average. The social worker wants to be within 3% of the true
proportion when using a 95% confidence interval. A previous study estimated the population proportion at
0.28.
(a). Using this previoius study as an estimate for p, what sample size should be used?
(b). If the previous study was not available, what estimate for p should be used?
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 Spring '08
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