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Information from AAA indicates that the mean age of passenger cars in the US is 8.4 years. A sample of 40 cars in the student lots at the local university showed the mean age to be 9.2 years. The standard deviation of this sample was 2.8 years. At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students?
a. What is the probability of a type I error?
b. Give the formula for the test statistic.
Find the standard error of the difference in sample means,
Kind of examination produced significant main effects on both mean mark and time taken to complete the examination.
In ANOVA, which of the following is not affected by whether or not the population means are equal?
Based on surveys conducted in 1989 and 1999, a researcher compared the proportion of high school age females interested in a career in science in 1989 with the proportion in 1999. He concluded that the proportions were not significantly different ..
Use this information to construct a probability table, and then calculate each of the following probabilities:
Regression equation Credits=15.4-.07. Select the correct statement. Increase in number of hours worked per week increases the expected number of credits.
The width of a confidence interval will be:
Develop three regression models to predict the selling price based upon each of the other factors individually. Which of these is best?
Explain probability distribution of X (name and parameters).
A process is out of control when:
At the 10% level of significance, is there sufficient evidence to indicate that more books are being loaned out per day, on the average?
Use a 0.05 significance level to test the claim that these credit rating are from a population with a mean that is equal to 700.
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