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1. Assuming a normal distribution, What is the z-score associated with the second quartile?
2. Find the following:P(z>2.43)
3. If we wish to have 95% confidence interval, what would be the value of the confidence coefficient?
4. In your own words, describe the relationship between the standard erro (of the mean) and maxium error.
5. In hypothesis testing, as the a level gets smaller, the level of confidence increases. T or F, and why or why not?
6. The calculated p-value for a hypothesis test is 0.084.
What decision about the null hypothesis would occur in the following:
The hypotheis test is completed at the 0.05 level of significance.
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pick a collection of values in reference to various variables from a web site. describe and list a few examples of your
For a normal probability distribution, about 95 percent of the area under normal curve is within plus and minus two standard deviations of the mean and practically all (99.73 percent) of the area.
Show that theta~ = u(X) is an unbiased estimator of theta, where u(0) = 1 and u(x) = 0 if x =1,2, ... Compare the MSEs of theta(hat) and theta~ for estimating theta = e^(-m) when m=1 and m=2
A random sample of 35m of the firm's accountants has a mean workday of 8.2 hours with a standard deviation of 0.5 hour. At α = 0.01, can you support the CEO's claim?
Now he wants to know if there is a difference between the three formats. Is there?
When finding percentiles, if locator L is not whole number, one procedure is to interpolate so that locator of 23.75, for instance.
For each of the following research questions does the situation or research question involve independent samples or paired data?
The proportion of drivers who use seat belts depends on things like age, gender, ethnicity, and local law. As part of a broader study, investigators observed a random sample of 117 female hispanic drivers in Boston
Is there sufficient evidence to conclude that a majority of U.S. adults feel this way? Test the appropriate hypotheses using a 0.01 significance level.
4 cards are drawn from a deck of cards without replacement what is the probability that at least 1 of the cards is a
a hospital would like to determine whether there is a relationship between the level of satisfaction of workers with
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