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The manufacturer of brand A jogging shoes wants to determine how long the shoes last before resoling is necessary. She randomly samples from users in Chicago, New York, and Seattle.
In Chicago, the sample size was 28, and the mean duration before resoling was 7.2 months.
In New York, the sample size was 35, and the mean duration before resoling was 6.3 months.
In Seattle, the sample size was 22, and the mean duration before resoling was 8.5 months. What is the overall mean duration before resoling is necessary for brand A jogging shoes?
Determine new, standardized score for each of following values from original population.
Suppose n = 4 dog owners are randomly selected. Find the expected number of persons, in the sample, who buy their dog holiday presents.
What is the significance level for the appropriate region of part (b)? How would you change the region to obtain a test with alpha=.001?
the wall street journal conducted a study of basketball spending at top colleges. a portion of the data showing the
a calculate the estimate for the standard error of difference between two independent means fornbsps12nbsp
In a certain region, the mean annual salary for plumbers is $51,000. Let x be a random variable that represents a plumber's salary. Assume the standard deviation is $1300.
Eagle Outfitters is a chain of stores specializing in outdoor apparel and camping gear. It is considering a promotion that involves mailing discount coupons to all its credit card customers.
a government agency has specialists who analyze the frequencies of letters of the alphabet in an attempt to decipher
a certain brand of fluorescent light tube was advertised as having an effective life span before burning out of 4000
The distribution of test scores is mui=35 and a standard deviation of 15. Do students taking the supplement have significantly better memory scores? Use a one-tailed t-test with an alpha=0.05.
Find a 95% confidence interval for the population mean selling price of all homes in this neighborhood.
q1. length of pregnanciesthe length of human pregnancies from conception to birth varies according to a distribution
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