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A sample of 25 production employees has been tested twice on a standard test of manual dexterity. The average change in the time required to finish the test was a decrease of 1.5 minutes, with a standard deviation of 0.3 minutes.
At the 0.05 level, can we conclude that the average production employee will complete the test more quickly the second time he or she takes it?
Let X be a random variable of the continuous type that has pdf f(x). If m is the unique median of the distribution of X and b is a real constant, show that E(X - bl) = E(X - ml) + 2 [(b - x)f(x) £lx, provided that the expectations exist.
Based on surveys conducted in 1989 and 1999, a researcher compared the proportion of high school age females interested in a career in science in 1989 with the proportion in 1999. He concluded that the proportions were not significantly different ..
the attached excel spreadsheet includes 500 randomly collected data points describing how many minutes of physical
Still assuming equal variances, test the hypothesis of equal means using Student's t-test and the data in the last problem. Use α = .05.
The agency found that 10% of the time, over 1,000 people respond immediately after a mailing, and 50% of the time, at least 650 people respond right after the mailing. Find the mean and the standard deviation of the number of people who respond fo..
from the following stem-and-leaf display find the minimum value the 1stquartile the median the 3rdquartile and the
Determining the strength of a correlation is very important to determine how well one variable can predict another. To determine the strength of a correlation, we have to calculate the correlation coefficient, r.
Organize data into a frequency distribution. How many classes would you propose? What value would you propose for class interval?
Compute the sample correlation coefficient between the two variables. Conduct a test, using an alpha value of 0.05, to determine whether the population correlation coefficient is significantly different from zero.
According to the ICR Research Group, 63% of Americans in the 18-34 age group say they are comfortable filing income tax returns electronically, compared to just 49% of those who are 55-64.- Determine and interpret the p-value for the test.
Emotional exhaustion, or burnout, is a significant problem for people with careers in the field of human services. Regression analysis was used to investigate the relationship between burnout and aspects of the human services professional's jo..
The mean height for a population is 65 inches and the standard deviation is 3 inches. Let A and B denote the events described below.
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