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The Department of Labor wants to estimate the percentage of females in the U.S. labor force to within ±5%, with 90% confidence. How many employment records should be sampled?
Is there a difference in the mean allowances nationally and the mean allowances in northwestern Ohio for nine-year-olds?
Demonstrate your understanding of choosing the type of regression model to the given data, by explaning three factors that should be taken into account in the choice between different models.
The 1996 GSS asked, "If husband in family wants children, but wife makes decision that she doesn't want any children. If standard error is 0.01429, determine the 96 % confidence interval for population proportion who would say yes.
A statistical study reported that a drug was effective with a p-value of .042. Explain in words what this tells you.
Among Americans who are auto racing fans, 59% identify NASCAR as their favorite type of racing. What is the probability that all four have NASCAR as their favorite?
Find the z-score for each score in the population. Transfer the original population into a new population of N=5 scores with a mean of μ=60 and a standard deviation of σ=8
Suppose the distribution of amounts purchased follows normal distribution. For sample of 50 customers, reply the following questions. Determine the probability the sample mean is at least $25.00?
A rental agent claims that the mean monthly rent, , for apartments on the east side of town is less than $675 . A random sample of 18 monthly rents for apartments on the east side has a mean of $661, with a standard deviation of $24.
For each of the F statistics given above find the degrees of freedom and an approximate P-value. Summarize the results of these tests.
Calculate the value of the chi-square statistic and test whether all regions are statistically the same at 5% and 1% level tests.
Find the 90%, 95% and 99% confidence intervals for the proportion of all voters who favor the issue. How many more voters should we include in the sample if we need to reduce the margin of error by half?
Give an example representing a discrete probability distribution and a continuous probability distribution. Explain why your choice is discrete and continuous.
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