Q1) For samples summarized below, test hypothesis at =.05 that two variances are equal.
|
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Variance
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Number of data values
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Sample 1
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19
|
8
|
|
Sample 2
|
9
|
18
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a) Reject hypothesis as the test value 2.11 is less than the critical value 3.16.
b)Reject hypothesis as the test value 4.46 is greater than the critical value 3.01.
c) Do not reject hypothesis as the test value 2.11 is less than the critical value 3.16.
d) Reject hypothesis as the test value 4.46 is greater than the critical value 3.01.
2) Medical researcher is interested in whether patients' left arms or right arms are longer. If 14 patients participate in this study (so that n left arms and n right arms are measured), how many degrees of freedom must researcher use in her t-test critical value supposing that variances are equal?
A)13
B) 27
C) 14
D) 26