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The distribution of a population of mechanical aptitude test is normal, with a mean of 46 and a standard deviation of 4. To test the impact of a job training program, a sample of 26 scores was obtained from employees who took the training program. The sample yielded a mean score of 53. Test the hypothesis that the training program has a significant effect on mechanical aptitude score.
What is the standard error of the mean for this sample?
What is the z-score for this sample?
What z-score must be obtained from the sample in order to reject the null hypothesis at an alpha level of .05?
State the null hypothesis and the alternative hypothesis for a test based on expected values of the mean for those who did not receive treatment.
the distribution of the amount of money in savings accounts for university of miami students has an average of 1100
when only concerned about the results at one end of the distribution curve we use a one-tail test. we generally see a
What are the differences between regression and correlation analysis? What is correlation? Does correlation prove causation? Why or why not? Explain and provide examples to support your explanation.
1. Using the Internet resources, find an example of a linear optimization model used in industry. Describe which industry it is or was used in and briefly discuss the problem or challenge it addressed.
Discuss the reason that sampling distribution of the mean follow a normal distribution for a large enough sample size, even though the population may not be normally distributed?
Test at 1% significance level that there exists a difference in proportion between men and women drivers who always use seat belts.
the closing stock price for each of two stocks was recorded over a 12-month period. the closing price for the dow jones
To speed up the process in a blood testing procedure, blood samples from 3 people are combined into one mixture. The mixture will on test negative if all individual samples are negative. If the probability than an individual sample tests positive ..
Heights of men on a baseball team has a bell-shape distribution with a means of 173 cm and a standard deviation of 9 cm. Using the empirical, rule what is the approximate percentage of the men between the following values?
Do the thinner cans appear to be strong enough so that they are not crushed when the top lids are pressed onto the sides?
Consider how you might apply radical expressions to your daily life. Explain this application, and discuss what the equation might be.
The personnel manager at a company wants to investigate job satisfaction among the female employees. One evening after a meeting, she talks to all 30 female employees who attended the meeting.
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