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In a manufacturing process a random sample of 9 bolts manufactured has a mean length of 3 inches with a sample standard deviation of .3 inches. What is the 95% confidence interval for the true mean length of the bolt? Assume a normal population distribution.
Critically discuss the difference between the standard deviation of the sampling distribution of the mean and the standard deviation of the sampling distribution of the median when we calculate the probability?
ANOVA is a powerful statistical test. How does ANOVA differ from other parametric tests? What are the conditions that must be met to use a one-way ANOVA?
Tim has two more problems to solve on his test, but he doesn't know how long it will take to finish them. He assigns mutually irrelevant normal distributions to the times
Agricultural researchers are studying three different ways of planting peanuts to determine whether significantly different levels of production yield will result.
(a) At the 5 percent level of significance, does this sample prove a violation of the guideline that the average patient should pay no more than $250 out-of-pocket? State your hypotheses and decision rule. (b) Is this a close decision?
State the null hypothesis and the alternate hypothesis. State the decision regarding the null hypothesis.
Assuming that students make their decisions independently, the number who accept has the B (1200, 0.75) distribution. If this number is less than 950, the college will admit students from its waiting list.
Plot the graphs of the following and identify the graph that represents the cooresponding functions and justify your answer.
Suppose the likelihood that any flight on Northwest Airlines arrives within 15 minutes of scheduled time is .90. We choose four flights from yesterday for study.
Give the example of when it is suitable to apply mixed method research in human services field. Sum-up how scientifically sound research supports function of human services manager.
A television station estimates that 45% of college students watch the Super Bowl. For a sample of 240 students selected at random, what is the mean and variance of the number of students who watch this game?
Do hotel managers on the average differ significantly in femininity score from men in general? Assume that the standard deviation of scores in the population of all male hotel managers is the same.
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