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You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 95% confidence level and that the estimated proportion must be within 2% of the population proportion. A pilot survey revealed that 5 of the 50 sampled hold two or more jobs. How many in the workforce should be interviewed to meet your requirements?
You are interested in determining the average cost of a 3-minute telephone call to locations within the continental U.S.
For the sheet-metal stamping machine in certain factory, the time between failures, X1 has a mean between the failures, of 56 hours and a variance of 16 hours.
How many dissimilar computer passwords are possible?
Determine the test sequence that minimizes the total expected cost of testing an item. Prove that your proposed sequence is optimal in minimizing the total expected cost of testing an item.
P-value for test statistic is .085, determine the minimum level of significance needed to reject null hypothesis?
A student scored 84 points on a test where the mean score was 79 and the standard deviation was 4. The student's z score was:
First, describe in your own words (no direct quotes, please) what a dummy variable is and its purpose in regression analysis. Secondly, provide an example of where you might use a dummy variable from your own professional experience.
We recalculated our comparison of ideal number of children, this time only for women, separating them into two groups, those who indicated that they were "very happy" or "not at all happy" with life.
A regional manager visits local fast-food franchises and evaluates the speed of the service. If the manager receives her meal within 45 seconds, the server is given a free movie-admission coupon.
A sample of 93 IQ scores was randomly selected from a certain population. At the 0.03 level of significance, test the hypothesis that the population has a mean IQ of 105.
A year ago, Air Force implemented new test for finding which candidates are most probable to become successful pilots. Now they wish to see if implementing pilot predictor test was a good idea. Scores have been standardized to facilitate comparis..
Determine which crew should be sent to each city to minimize the total distance traveled. How many miles will be traveled if these assignments are made?
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