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A university has 10,000 students of which 45% are male and 55% are female. If a class of 30 students is chosen at random from the university population, find the mean and variance of the number of male students.
The height of a tree will be measured using a clinometer. For this device, the measurement error has a normal distribution with mean meter and standard deviation . If the tree is exactly 35 meters tall, what is the probability that the clinometer ..
State the alternate hypothesis for this study? What critical value should be used to determine the rejection region? Use the 1 proportion Z-test.
Calculate the difference in the average "clutter" between network and TV.
Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major.
You will actually have negative sales using this multiple regression analysis
What is the probability that a simple random sample of automobile insurance policies will have a sample mean within $25 of the population mean the for each of the following sample sizes: 30, 50, 100, 400?
An insurance company is trying to determine if there is a significant difference in the average number of sick days that registered nurses and nurse practitioners use per year. The data analysis provided the following output.
One approach would be to contact every psychology graduate student you know and ask them to fill out a questionnaire about it.
Using the p-value approach, test the hypotheses at the 1% level of significance.
At.05 level of significance, is there evidence to propose that mean life length of the batteries manufactured by this manufacturer is more than 400 hours?
At 95% level of confidence, can we conclude that the babies using the Gibbs product gained less weight?
A random sample of 20 users is obtained. Using the Binomial Probability Distribution, determine the following probabilities?
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