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Over the past year, the vice president for human resources at a large medical center has run a series of three-month workshops aimed at increasing worker motivation and performance. To check the effectiveness of the workshops, she selected a random sample of 35 employees from the personnel files. She collected the employee performance ratings recorded before and after workshop attendance and stored the paired ratings for all 35 in Perform.
Which of these variables are discrete and which are continuous random variables?
A supervisor has noticed that sales for all departments world wide has been averaging $12,000 a month for a number of years. For the last 18 review periods the average sales figure has dropped to $11,500 with a standard deviation of $4,000. Manage..
Use the t test to determine whether the slope of the regression model is significant at α = 0.05.
The Graduate Management Admission Council, who administers the test, claims that the mean total score is 529. Suppose a random sample of 8 students took the test, and their scores are given below. 699, 560, 414, 570, 521, 663, 727, 413 Use α = .05..
Suppose we wish to predict the crawling age of a particular baby when the average outdoor temperature is 25°F six months after birth.
Interpret the three confidence intervals in terms of whether there is a significant difference between the mean of the sample and a hypothesized mean of 150.
With the test statistic you chose, work out the problem with solution using .05 level of significance if it applies.
Here are the DMS odor thresholds for 10 untrained students:
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
What is the probability that a student who has failed the test came from the South District?
The researcher expects a 12-point treatment effect and plans to use a two-tailed hypothesis test with a = 0.05.
If the agency is risk neutral, use a decision tree to determine its best course of action.
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