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The Bureau of Labor Statistics reported that the average yearly income of executives in the year 2005 was $110,000. A sample of 81 executives, which was taken in 2006, showed an average yearly income of $120,000.
a. We want to test to determine if there has been a significant increase in the average yearly income of executives. Develop the null and alternative hypothesis for this problem.b. Test this problem at 99% confidence and provide conclusion.c. Would the problem have a similar conclusion if we knew the population standard deviation was $40,000? Why?
Suppose that that download time is normally distributed with a standard deviation of 0.2 seconds. What is the probability that a download time is less than 1 second?
A random group of students was selected from a large student conference to analyze their class in school. Is there evidence to reject the hypothesis that the number of students is equally distributed between the four classes, at alpha = .05?
An anatomy teacher hypothesizes that the final grades in her class are distributed as 10% A's, 23% B's, 45% C's, 14% D's, and 8% F's. At the end of the semester, she has the following grades.
Find the moment generating function of their sum and identify the corresponding distribution, its mean and its variance.
what is the expected number of claims by males under 25? what is the standard deviation of the distribution. (How to show on excel using binodist formula).
The next 20% a B, the next 42% a C, the next 18% a D and the bottom 12% an F. What average must you exceed to obtain an A?
To estimate the mean of the population from sample information, we need to calculate the standard deviation of the distribution of the sample means around the population mean.
You're asked to determine whether the workers live in the community. Your personnel department provides the following table:
The sample mean and the standard deviation were determined to be 120 and 40 respectively. The standard error of the mean is?
Employees of MNM Corporation are about to undergo a retraining program. Management is trying to determine which of three programs is the best.
Test the claim that the mean weight loss is greater than 0. Based on these results does the diet appear to be effective. Does the diet appear to have practical significance.
5 cups of coffee per day with a standard deviation of 1.5. The distribution is normal. What proportion of faculty consume an amount between 4 and 6 cups?
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