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Which of the following is not an advantage of using a cluster sample instead of other types of samples?
a. it can reduce cost
b. it is convenient to use
c. it can simplify field work
d. the groups of people tend to be more homogeneous
In a market study for Target, a researcher found that 70% of customers are repeat customers. If 14 customers are selected at random, find the probability of getting.
Assume the risk-free interest is 5%. If WT borrows $100 million today at this rate and uses the proceeds to pay an immediate cash dividend, what will be the market value of its equity just after the dividend is paid, according to MM?
Gestational Age (Gestage, weeks) for sample of 100 low birth weight infants, and output from fitting a simple linear regression model to data, regressing Headcirc (Y) on Gestage (X).
Assuming we can verify that the data set is approximately normally distributed, what percentage of times will the server be down less than 24 minutes?
Suppose that the incidence of MI is 0.005 per year among subjects who are actually take placebo and that aspirin prevents 20% of MIs
Conditional and compound probabilities.The table below gives the distribution of blood types by gender in a group of 1000 individuals.
A large internet retailer is studying the lead time (elapsed time between the time when the order is placed and the time it is filed). The table below gives the lead times (in days) for a random sample of recent orders.
Evaluate the difference in the mean ratings and find the standard deviation of the difference in the ratings, what is the chance both children are boys?
a) 95% of confidence intervals generated will include the sample mean X. b) 5% of the confidence intervals generated will include the true mean μ
Using the z table in Table E of Appendix C, determine the critical value for the hightailed test with a = 0.035.
If the average low temperature of a winter month in Rochester, NY, is 16° and the standard deviation is 4.6 then according to Chebyshev's theorem, the percentage of average low temperatures in Rochester, NY, between 2.2° and 29.8° is %.
What is the probability that a randomly selected automobile manufactured by the company will have a defective microprocessor?
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