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Lester Hollar is vice president for human resources for a large manufacturing company. In recent years, he has noticed an increase in absenteeism that he thinks is related to the general health of the employees. Four years ago, in an attempt to improve the situation, he began a fitness program in which employees exercise during their lunch hour. To evaluate the program, he selected a random sample of eight participants and found the number of days each was absent in the six months before the exercise program began and in the last six months following the exercise program. Below are the results.
1 7 5
2 7 2
3 5 1
4 6 2
5 4 3
6 5 6
7 7 3
8 7 7
At the 0.05 significance level, can he conclude that the number of absences has declined? Hint: For the calculations, assume the "Before" data as the first sample.
Reject H0 if t > ___________ (Round your answer to 3 decimal places.)
The test statistics is_______________(Round answer to 3 decimal places)
Using binomial distribution find the probability that 2 or 3 women in a sample of 20 will never be married.
Does the data set represent a sample or a population? If it is a sample, describe the population from which it has been drawn.
At a food processing plant, a machine produces 10 lb bags of sugar. In this particular process, it is important that the sugar content does not go below 9.9 lbs. In fact, when the bags of sugar are less than 9.9 lbs, maintenance is performed..
a man and a woman agree to meet at a cafe about noon. if the man arrives at a time uniformly distributed between 1140
the following data are from an independent-measures experiment comparing two treatment conditions. do these data
Computer-generated output indicates that the p-value for the sample is 0.01. Carefully interpret this p-value. At what levels of significance would you reject the null hypothesis?
a research team plans to test the null hypothesis that ? .45 sigma.5. the test is right sided. a sample size of n1550
the probability of a successful missile launch is 0.9. test launches are conducted until 3 successful launches are
a computer help desk is provided by gregory. some of the callers need assistance with hardware and other with software.
Describe the chi-square test of independence. How is this test different from the chi-square goodness-of-fit test? Are the assumptions underlying each of these tests the same?
The number customers who enter a supermarket each hour is normally distributed with a mean of 600 and a standard deviation of 200. The supermarket is open 16 hours per day.
madeleine is an intern at a hospital on a ward that deals primarily with patients who have bi-polar disorder. after a
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