Any help with stat question will be appreciated

Robert

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Apr 24, 2010
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2
Please help me with this question. I am struggling.
Your help and time is very appreciated.

Given the hypothesis: Ho : µ?20 &Ha: µ<20, a random sample of five resulted in the following values: 18, 15, 12, 19, &21. Using the ,01 significance level, can we conclude the population mean is less than 20?
a) Is this a Z or t test?
b) Test statistic =?
c) Critical value = ?
d) Reject Ho: (yes or no)
 
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