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Find the critical value for different types of sample size and level of significance:
A paired difference experiment yielded and pairs of observations. In each case described below, what is the rejection region for testing H0: mean= 6 against Ha: mean >6. Use standard deviation = 8.1. a) nD = 43, a = 0.07 z>
b) nD = 29, a = 0.01
c) nD = 9, a = 0.03 t >
Suppose the population is normally distributed they make a decision to do a hypothesis test.
Prepare the confidence interval of 95% for the welders' proportion that graduated in the school of welding.
An SRS of 100 of a certain popular model car in 1993 found that 20 had a certain minor defect in the brakes. An SRS of 400 of this model car in 1994 found that 50 had the minor defect in the brakes. Let p1 and p2 be the proportion of all cars of t..
The level of significance indicates the probability of rejecting a false null hypothesis.
Follow the conventions as described in the general guidelines for writing up Special Problems.
What is the probability that a cereal would either high calorie or high fiber? In other words, what is P(high calorie or high fiber)?
If we select a crew member at random, what is the probability the crew member earns:
Using the simple test of independence (described in the lecture), decide if the events high calorie and high fiber are independent or dependent. Show your work.
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
In a survey conducted to see how long Americans keep their cars, 2000 automobile owners were asked how long they plan to keep their present cars. The results of the survey follow. Find out the probability distribution associated with these data.
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments.
Find out the expected shape of distribution of sample mean?
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