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A researcher conducts a t test for dependent means with 10 subjects. If the estimated population variance of the change scores is 20, what would the variance of the distribution of the means of change scores be?
A. 20/10=2.0B. 20/9=2.2C. 400/10=40.0D. 400/9=44.4
State a type I error and describe why it happens. Describe the factor that researcher can control to change type I error. Also, describe how type I errors can be avoided.
An education task force looking at poverty levels in the United States has collected data for each state and the District of Columbia on the total number of people below the poverty level and the number of adults over the age of 25 who did not g..
Test to determine if there is a significant negative relationship between the independent and dependent variable at alpha=.05 and .01.
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If demand is normally distributed, a basic EOQ is appropriate. a single-period model could not be appropriate. we should produce to fill demand, rather than filling it through orders.
Assuming 12=22, use a significance level of =.05 test to the null hypothesis H0: 1 - 2 = 0 against the alternative H1: 1 - 2 > 0. Does the test reject H0?
If a new graduate is given a bunch of flowers from this outlet, what is the probability that the flowers were purchased by their partner or friend?
Your company sells exercise clothing and equipment on the internet. To design the clothing, you collect data on the physical characteristics of your different types of customers.
Random sample of 64 lightbulbs indicates a sample mean life of 350 hours. At a 5% level of significance, is the mean life more than 375. Which of the following is your two hypotheses?
Assume the population standard deviation is 7.1 mpg. State the correct null and alternative hypotheses that the company wishes to test. Calculate the test statistic that would be used for conducting the desired test.
Show all work. What is the probability that a randomly selected US resident did not live in Idaho? The total 2008 US population was 303,824,640.
Explain in managerial terms what is meant by "use an alpha level = .05." Do you agree with her suggestion? If so, explain why. If not, explain why and indicate the alpha level you would use instead.
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