(The following setup may be used for multiple questions.) In order to use a 90% confidence...
(The following setup may be used for multiple questions.)
In order to use a 90% confidence interval to compare admission exam scores for sophomores (group #1) and freshmen (group #2), two independent random samples were selected. The results showed:
1-Sophomores: Sample mean = 85, sample standard deviation = 10, sample size = 50.
2-Freshmen: Sample mean = 78, sample standard deviation = 12, sample size = 72.
For forming a 90% confidence interval for μ 1 − μ 2, the standard error is __________ .
Group of answer choices
12
None of the other choices represent a suitable response.
10
4
2
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(The following setup may be used for multiple questions.)
In order to use a 90% confidence...
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