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If Suzie gets a 70 in a statistics class where the mean is 65 and the standard deviation is 5.8, but Kathy gets a 90 in a different statistics class where the mean is 85 and the standard deviation is 4.59, who did better relative to their class? Note both did better than the class mean. How do you answer this question?
A researcher wanted to invetigate whether there is a significant difference in the average age of instructors, assistant professors, assocated professors and full professors at a university. The faculty was selected at random and their ages were r..
For each of the following hypotheses, decide whether a one-tailed or two-tailed test would be performed: Children with birth defects will score differently than the normal population on a measure of self-esteem.
Find the indicated probability using the geometric or Poisson distribution. A newspaper finds that the mean number of typographical errors per page is nine. Find the probability that?
Suppose that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more?
Use this information to construct a probability table, and then calculate each of the following probabilities:
How many degrees of freedom must researcher use in her t-test critical value supposing that variances are equal?
Listed below are measured loads (in lb) on the left femur of crash test dummies used in the same cars listed in the Chapter Problem. Use a 0.05 significance level to test the null hypothesis that the different car categories have the same mean. Do..
Find the questions based on multiple regression - The coefficient of determination for the above model is approximately
At 95% confidence using the p- value approach, test the hypotheses. Let α = 0.1.
The number of passengers on the Carnival Sensation during one-week cruises in the Caribbean follows the normal distribution.
Exam is given to 20 randomly chosen students and their average length of t time needed to finish exam was 54 minutes with standard deviation of 5.99 minutes. Test instructor's claim at the 0.05 level of significance.
The auto parts department of an automotive dealership sends out an average of 8 special orders daily. The number of special orders is assumed to follow a Poisson distribution.
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