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The Roper Organization conducted identical surveys in 1990 and 2000. One question asked women was, "Are most men basically kind, gentle, and thoughtful?" The 1990 survey revealed that, of the 3,000 women surveyed, 2,010 said that they were. In 2000, 1,530 of the 3,000 women surveyed thought that men were kind, gentle, and thoughtful. At the .05 level, can we conclude-that women think men are less kind, gentle, and thoughtful in 2000 compared with 1990?
Several samples of size 56 are randomly selected and means computed. What value would you expect to determine for standard deviation of all these sample means?
A corporate executive officer is attempting to arrange a meeting of his three vice presidents for tomorrow morning. He believes that each of these three busy persons, independently of the others
The Pearson Product-Moment Correlation Coefficient (r) is a measure of linear relationship between two variables.
What other information would you like to know to answer the question about salary equity between the genders? Why?
What are independent samples? What is a pooled estimate of variance and why do you need to calculate it? When do you use a dependent versus an independent sample t test?
At 95% confidence using the p- value approach, test the hypotheses. Let α = 0.1.
Create a scenario where the binomial probability formula could be used to determine the probability of some number of successes, x, in some given number of trials,n.
Political polls typically sample randomly from the U.S population to investigate the percentage of voters who favor some candidate or issue. The number of people polled is usually on the order of 1000.
Sketch density curves that might explain distributions with fallowing shapes: symmetric, but with two peaks( i.e., two strong clusters of observations)
The level of glucose, x, in blood follows a normal distribution with mean = 13.8, and std dev = 2.6. What is the probability that in a healthy adult:
Suppose we wish to test the hypothesis H0: = µ2 vs. H1: = µ≠2 We find a two sided p-value of .03 and a 95% CI for µ of (1.5, 4.0) Are these two results possibly compatible? Why or why not?
It is believed that population standard deviation is 15 days. If test is conducted using 0.05 level of significance, what conclusion must be reached?
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