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Construct a 99% Confidence Interval for the value of the mean pertaining to the South Carolina residents' income. show the area under the curve to graphically demonstrate your answers.
Find the critical value of t with a c below it for the given confidence level c and sample size n. construct the indicated confidence interval for the population mean looks like a funny shaped.
Of the rolls used by a manufacturer, 70% are cotton and 30% are nylon. what is the probability that a randomly selected roll used by manufacturer contains flaws.
The cheerleaders for a local professional basketball team must be between 65.5 and 68.0 inches. If a woman is randomly selected, what is the probability that her height is between 65.5 and 68.0 inch
Test, against the alternative that it is positive, the null hypothesis that B9 is 0. Interpret your result. Find and interpret the coefficient of multiple correlation.
Construct a 95% confidence interval for the standard deviation of the number of hours this firms employees spend on work related activities in a typical week. Need lower and upper limit rounded to 1
Can we accept the hypothesis that the mean lifetime of the bulbs is equal to 850 hours at the level of signi cance 5%? State precisely the assumptions you make and the distribution you use.
What is the probability that Group I is different from Group 2, using the p value? Is it significant against the benchmark of p < .05?
Determine the minimum sample size required to construct a 99% confidence interval for the population mean shoulder height of : a) male bears standard deviation of 12.4.
The sample of 50 students reported they spent an average of 80 minutes per week studying statistics. Assume σ = 35. Find a 99% confidence interval for the population mean minutes per week spen
Find the mean and standard deviation of the population of all possible sample means when we assume that µ equals 6.
Suppose 80% of students finish high school. Of them, 50% finish college. Of them, 20% get a master's degree. Explain how your reasoning in (i) used a multiplication rule with conditional probabilities
Candidates for employment at a city fire department are required to take a written aptitude test. What are the mean and standard error of the sample mean scores?
Carry out the appropriate test for the equality of variances if necessary. Were we right to combine all patients for our answer in (a)?
The mean amount wagered by all patrons is $287 with a standard deviation of $15. You should give free accommodations to those individuals who wager over how much money?
Suppose Babsie generated the following probability distribution: Is this probability distribution discrete or continuous? Explain your reasoning.
Human Resources wishes to determine if there is a relationship between various employee classifications and preference for three proposed benefit plans. Find the test statistic value.
The company doing the study wishes to develop a 95% confidence interval on the average dollar value of orders. Find the value for the point estimate.
Determine how large a sample they would need to take in order to be 99% certain that the maximum error in the predicted population proportion was 2%.
Test at alpha=.02 to determine if there is a difference in the proportion of humorous ads in the two industries. Formulate the appropriate hypothesis
Test at alpha=.05 to determine if there is a difference in the average years of occupancy for these two neighborhoods. Assume the standard deviations to be equal.
This question is meant to demonstrate again the relationship between an F-test (in this case the partial F-test) and a t-test on slope. The p-value for the t-test of the individual slope coefficient
In a random sample of 1020 consumers, you find 35% have stopped buying the product. At a=.04, do you have enough evidence to support the claim.
At the .05 level of significance, is there evidence of a difference in the mean price of LNG in the six counties? Which counties are different? Which counties are the best/worst?
Develop an estimated regression that can be used to predict the price per share given the book value per share and the return on equity per share. At the .05 level of significance, test for overall