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Suppose a simple random sample of size n=49 is obtained from a population with u=71 and o=21. Describe the sampling distribution of x. (Distribution skewed right, left, normal, uniform, unknown, norma
Test the hypothesis using the P-value approach. Be sure to verify the requirements of the test.
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x*, is found to be 111, and the sample standard deviation, s, is found to be 10.
A population has a mean 72 and standard deviation 12. Find the mean and standard deviation of a sampling distribution of a sample means with sample size n 36.
Determine the t critical value for a two-sided confidence interval in each of the following situations. (Round your answers to three decimal places.)
A random sample of 40 adults with no children under the age of 18 years results in a mean daily leisure time of 5.29 hours, with a standard deviation of 2.29 hours.
Does x have a binomial distribution or a hypergeometric distribution? Support your answer. Find the probability that three internship-trained candidates are hired for these positions.
A 8-sided die is rolled twice. Let X be the sum of the two rolls, Y be the first minus the second, and Z be the 4 times the first, minus the second.
For a group of 120 people, assuming that each person is equally likely to have a birthday on each of 365 days in the year, compute. The expected number of days of the year that are birthdays of exac
Consider 50 independent flips of a coin having probability 0.4 of landing on heads. We say that a changeover occurs when an outcome is different from the one preceding it. Find the expected number o
It is reasonable to model the number of winter storms in a season as with a Poisson random variable. Suppose that in a good year the average number of storms is 5, and that in a bad year the average
If the number of people entering an elevator on the ground floor is a Poisson random variable with mean 12, and if each person is equally likely to get off at any floor, independently of the others,
Suppose a linear regression equation was calculated to fit the relationship between the percentage of the adult population that is obese and the percentage who felt that they are very happy.
Why is a randomized, blinded experimental study best for establishing cause-effect relationships?
Consider the situation in a case-control study where the crude odds ratio is 4.6, stratum 1 odds ratio is 1, and stratum 2 odds ratio is 3.0. Which of the following is present:
The researcher suspects that the new drug results in greater average reduction in blood pressure than the old drug does. The P-value for the test described in (again, using Option 2 for degrees of fre
For a standard normal curve, find the z-score that separates the bottom 90% from the top 10%
A histogram showing the different responses from five groups of government employees is used in a report to emphasize the different results. A group accounted for 60% of the response, another 20%.
What theorem states that a distribution of sample means is approximately normally distributed if the sample size is large enough?
What is the test value for a test of the difference between these two population proportions?
A nutritionist wants to determine how much time nationally people spend eating and drinking. Suppose for a random sample of 956 people age 15 or older, the mean amount of time spent eating or drinki
Assume that matched pairs of data result in the given number of signs when the value of the second variable is subtracted from the corresponding value of the first variable. Use the sign test with a
A chi-square test for goodness of fit is used in a situation with n = 60 subjects distributed over three categories. The df value for this test is.
If the alpha level is increased from a = .01 to a = .05, what happens to the size of the critical region.
A student takes a calculus midterm and a history midterm. The mean and standard deviation on the calculus midterm are 58 and 15 points while they are 63 and 35 on the history midterm. Suppose she ge