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In order to estimate the difference between the average hourly wages of employees of two branches of a department store, the following data have been gathered.
Downtown Store
North Mall Store
Sample size
25
20
Sample mean
$9
$8
Sample standard deviation
$2
$1
A 95% interval estimate for the difference between the two population means is:
A. 0.078 to 1.922
B. 1.922 to 2.078
C. 1.09 to 4.078
D. 1.078 to 2.922
Is there evidence that population mean amount is different form 8.17 ounces? (Use a 0.05 level of significance.) with sample standard deviation of 0.051 ounce.
Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention.
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The first unit produced after the calibration effort to be found to be defective. What is the probability that machine is in adjustment?
Use this information to construct a probability table, and then calculate each of the following probabilities:
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Make up a scatter diagram with 10 dots for each of the following situations:
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Perform a contingency analysis on the data to determine if there is any dependency between the number of level of education attained by the father and the size of his family.
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