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With a normal distribution of 50 and standard deviation of population =10, how do I figure out the score at the 40th percentile? How do figure out the % of scores falling above 70? How do figure out between what scores do the middle 50 percent of cases lie? Note N=1000
Tim has two more problems to solve on his test, but he doesn't know how long it will take to finish them. He assigns mutually irrelevant normal distributions to the times
Use a 5% significance level (95% confidence level) to test the claim that the different vehicle categories have the same mean MPG.
Pretend that you are a Finance person in a large dynamic company. Your dream is to become CFO someday, so you want to make good financial decisions.
The firm uses $200,000 of its cash balance to pay off a current liabilities. Calculate the current ratio before and after this transaction.
Sketch the distributions involved, and (c) explain your answer to someone who is familiar with the t test for a single sample but not with the t test for independent means.
With what degree of confidance can we state that the average weekly salary for all teachers in this area is between $487 and /4517.
Determining whether or not the proportion of the population in favor of Candidate A is significantly more than 80%. The value of the test statistic and the p-value respectively are?
A drug manufacturer wants to estimate the effect of its new drug designed to increase patients white blood cell count.
In the last municipal election, a sample of 350 registered voters showed that 85 voted for the incumbants. Find out a 98% confidence interval estimate for the proportion of all voters voting for the incumbants.
The mean of a set of 7 numbers is 13. What is the sum of the numbers? Find the mode of the following test scores: 89, 78, 91, 82, 75, 89, 84, 95, 89, 93
Calculate a 95% confidence interval for the mean endowment of all the private colleges in the United States assuming a normal distribution for the endowments.
"Determine if the statement is a typical null hypothesis (Ho) or alternative hypothesis (Ha). The average price of a particular statistics textbook over the Internet is the same as the average price of the textbook sold at all bookstores in a coll..
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