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Unformatted text preview: a random
sample of size . 3. Assess the Evidence
a. Calculate the mean and the standard deviation ̂ ̂ √ ( ) ̂ b. Calculate the test statistic c. Calculate the -value.
i. Right-tailed test: -value
ii. Left-tailed test: -value
iii. Two-tailed test: -value
(whichever -value is smaller)
4. State a Conclusion
a. Compare the -value from part 3c to the given level of significance :
, then we reject
and find enough evidence to support
, then we fail to reject
and do not find enough evidence to support ) Answers to Practice Problems – To get full credit, you would have to show all of the following information.
1. and ( .
̂ . . ̂ ( √ ̂ ) ) so the normality criteria is satisfied. . . (
, so we reject
and find enough evidence to support . Therefore, there is sufficient evidence to say
that more than 75% of people have brown hair at the 1...
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This document was uploaded on 04/03/2014.
- Spring '14