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How healthy are the employees at Direct Marketing Industry? A random sample of 14 employees was taken, and the number of days each was absent for sickness was recorded during a 1-year period. The sample mean was 6.1 days with a standard deviation of 4.3 days. Create a 95% confidence interval for the population mean days absent for sickness based on this sample. Select the answer closest to your results.
With the test statistic you chose, work out the problem with solution using .05 level of significance if it applies.
Construct a 90% confidence interval for the population proportion p . Does your result agree with your conclusion in part (a)?
By using the 0.10 level of significance, is there evidence that the population mean is above the $300?
If we select a crew member at random, what is the probability the crew member earns:
Test the claim that the mean age of the prison population in one city is less than 26 years. Sample data are summarized as n = 25, x = 24.4 years, and s = 9.2 years. Use a significance level of α = 0.05.
The data below shows the time to process an inpatient admission, before and after a system usage training session was given. The following hypotheses were formulated for this study.
Can we conclude that there is a positive association between the size of the home and the selling price? Use the .05 significance level.
The best estimator or appreciative of the population proportion is 0.45. How large must the sample be?
The area under a normal curve is always equal to 1, no matter what the mean and standard deviation are.
Conclude the finite population, correction factor.With the population size of 1,000 and a planned sample size of 200, what is the finite population, correction.
Researchers are studying the absorption of two drugs into the bloodstream. Each drug is to be injected at three dosages. There are 24 people in the study, and they are randomly divided into six groups.
Construct a 95% confidence interval for the proportion of all those who experience some type of discomfort.
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