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The average on an exam is 75 and the standard deviation is 17. If the instructor assigned grades based on the Normal distribution what percentage of students will make A's and what percentage will make B;s in teh exam. Assume standard cut-off for (A>=90) and B (80<=X<90)
Employees of a local university have been classified according to gender and job type. The following table provides data about the employees.
A shock can cause the failure of component 1 alone with probability p, component 2 alone with probability q, both components with probability r, or have no effects with probability 1-p-q-r. Suppose no repairs are possible and the system fails when..
You listen to radio station for 1 hour, at arbitrarily selected time, and carefully observe that amount of advertising time is equal to 7 minutes. Compute z-score for this amount of advertising time.
Steps in hypothesis test procedure - conducting a hypothesis test for some general statistic, ? say.
Perform a proper analysis. Describe your null and alternative hypothesis, report the p-value. What is your conclusion?
Use the relative frequency approach to construct a probability distribution for the number of tests taken.
A sample of ten ER patients was conducted to determine their average wait time and to compare this to the target wait time. The hospital wants to make sure that patients do not wait more than 35 minutes. Test following hypotheses using a 95% con..
Find out the suitable critical value(s) for this situation given a 0.05 significance level. Find out/compute the value of sample test statistic.
A random sample of 400 observations produced a sample proportion of 0.32. What is the standard error to construct a 99.5% confidence interval.
To determine whether two categorical variables are independent, one should use the:
The Price-to-Earnings ratio (P/E) of a publicly listed profit-making company is defined as the ratio of the stock price of the company to the earnings per share.
Women in the U.S. Air Force have hands that are 6.9 inches on the average (from the tip of the middle finger to the heel of the hand). The standard deviation is 0.34 inches. Assume that hand length is normally distributed.
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