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Before 1918, approximately 57% of the wolves in the New Mexico and Arizona region were male, and 43% were female. However, cattle ranchers in this area have made a determined effort to exterminate wolves. From 1918 to the present, approximately 71% of wolves in the region are male, and 29% are female. Biologists suspect that male wolves are more likely than females to return to an area where the population has been greatly reduced.
Find the probability that the mean aptitude test score for a randomly selected group of 150 8th graders is between 98 and 102.
Suppose the random variable X is normally distributed with mean =50 and standard deviation =7 calculate P(X).
Your workplace reduces all workplace scores on particular employee aptitude test in z-scores which are placed in district-wide distribution of scores.
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
Standard deviation of 2.5 minutes. What does Chebyshev's Theorem say about the percentage of employees with commuting times between 58.6 minutes and 68.6 minutes?
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.
By using the age midpoints x and the percentages of nurses, do we have a valid probability distribution? Describe.
What is the population? What values does the population distribution describe? What is this distribution? What values does the sampling distribution of x describe? What is the sampling distribution?
For each of the following, indicate whether or not you would expect it to have a strong seasonal component and why.
Explain the purpose of the chi-square test for independence. Provide some practical examples where this test might be used in business.
In what areas of your business is it important to draw inference? Describe a time when drawing an inference may have hurt your business.
John runs a computer software store. He counted 130 people who walked by his store in a day, 59 of whom came into the store. Of the 59, only 24 bought something in the store.
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