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Question: The personnel manager for a large company is interested in the distribution of sick-leave hours for employees of her company. A recent study revealed the distribution to be approximately normal, with a mean of 58 hours per year and a standard deviation of 14 hours. An office manager in one division has reason to believe that during the past year, two of his employees have taken excessive sick leave relative to everyone else. The first employee used 74 hours of sick leave, and the second used 90 hours. What would you conclude about the office manager's claim and why?
in a multiple regression analysis with two independent variables the multiple standard error of estimate measures the
Draw the scatter graphs for the other pairings in Table 15.2 and come to a decision whether the relationships are linear. Note the pattern-data link.
Identify the variable of interest and the unit of measurement and what proportion of reaction times are less than 2.00 seconds?
Two independent random samples of 25 waiting times in each of the counters gives s1 = 2.5 minutes and s2 = 3.1 minutes. Carry out the test of equality of variances, using α = 0.02.
Find the mean, median, and range for each of the two data sets. b.Find the standard deviation using the rule of thumb for each of the data sets.
For the data given below, regress one variable on the other. Is there an implication of causality, or are both variables affected by a third?
Some food retailers propose subjecting food to a low level of radiation in order to improve safety, but sale of such "irradiated" food is opposed by many people. Suppose a grocer wants to find out what his customers think.
Kansas City prefer the new package, the probability that Catherine's random sample of 300 households will have a sample proportion greater than 0.45 is?
suppose small aircraft arrive at a certain airport according to a poisson process. the mean time between arrivals of
An example of Simpson's paradox: full-time students do better in both kinds of courses but worse overall because they take more science courses.
The average patient should pay no more than $250 out-of-pocket? State your hypotheses and decision rule. (b) Is this a close decision?
If you select a U.S. college student at random, the probability is 0.56 that you have selected someone who will graduate within six years. Do you think that this probability would apply to all colleges?
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