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1. Which test would be most appropriate to answer the following research question: Do patients with a history of cocaine use have more gum line cavities than other patients? There were 15 people in the sample, and the number of gum line cavities was not normally distributed.
2. Which test would be most appropriate to answer the following research question: Is there a difference in the number of outpatient medical visits a year between people who live in urban areas and those who live in rural areas? There were 22 people in the sample, and the number of visits was normally distributed.
What are the similarities and main differences between fitting a linear regression trend to a time series and linear regression equation described in Chapter 13?
Is the negative state of the world today the fault of the United States? or is the positive state of the world to the credit of the United States?
Suppose 94 percent of the items have lives exceeding 2000 h and 3.51 percent have lives exceeding 16,240 h. Find the mean and standard deviation of the service life.
1. A sample of 65 observations is selected from one population. The sample mean is 2.67 and the sample standard deviation is .75. A sample of 50 observations is selected from a second population
the table below gives information on coded length measurements in a machining process. the data shown are macrx and r
Suppose a fair die is rolled ten times. Find numerical values for the expectations of each of the following random variables.
Is there any statistically significant difference in how the drugs perform? If so, explain the effect. Use the post hoc tests as needed.
Calculate the probability that a flight will depart early or on-time. Calculate the probability that a flight will arrive late. Calculate the probability that a flight departs late or arrives early.
life expectancies for men and women were measured by country. it was found that the average male life expectancy was
A company produces and ships 16 personal computers knowing that 4 of them have defective wiring. The company that purchased the computers is going to thoroughly
Baseball player Mark McGwire broke a record when he hit 70 home runs in the 1998 season. During that season, he was at bat 509 times. If one of those "at bats" is randomly selected, find the probability that it is one of the times he did not hit a..
With reference to Exercise 43, use the theory of Exercise 22 to construct a 99% confidence interval for α. The following are the scores that 12 students obtained on the midterm and final examinations in a course in statistics:
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