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A student at a four-year college claims that mean enrollment at four-year colleges is higher than at two-year colleges in the United States. Two surveys are conducted. Of the 35 two-year colleges surveyed, the mean enrollment was 5068 with a standard deviation of 4777. Of the 35 four-year colleges surveyed, the mean enrollment was 5466 with a standard deviation of 8191. (Source: Microsoft Bookshelf)
Assume that the population of heights of male college students is approximately normally distributed with mean m of 68 inches and standard deviation s of 3.75 inches. A random sample of 16 heights is obtained.
Formulate the appropriate testing hypothesis problem and carry out the test if a = 0.05.
The average fill volume of a regular can of soft drink is 12 ounces. Suppose the fill volume of these cans ranges from 11.97 to 12.03 ounces.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
a professor in the school of business wants to investigate the prices of new textbooks in the campus bookstore and the
Find the random variable X (remember that X is the difference between the two sample means). State the distribution you will use and why? What is the test statistic (t-value)?
Explain the research hypothesis. Describe your sample and your sampling method.
Find the sample size for the 95% confidence interval used to estimate the population proportion.
Now calculate the probability that a success is obtained on each of the three respective trials and, therefore, demonstrate that the trials are dependent.
An examination of sample items from a shipment showed that 51% of the items were good and 49% were defective. The company president asked the statistician.
Translate the following statements into symbolic form using capital letters to represent affirmative English statements.- Katie Couric and Diane Sawyer report international news if and only if Erica Hill and Norah O'Donnell cover political developm..
Regard the positions of molecules I a room as the points of a Poisson random scatter in 3 dimensions. According to physics.
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