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An advertising agency that serves a major radio station wants estimate the mean amount of time that the station's audience spends listening to the radio daily. From studies, the standard deviation is estimated as 45 minutes. what sample size is need if the agency wants to be 90% confidence of being correct to within +/- 5 minutes? if 90% is desired, how many listeners need to be selected?
Using the .02 level of significance, conduct a five-step hypothesis testing procedure to determine if the new processes significantly reduced the wait time.
What quantitative method can be applied to help the Department make the decision? Outline how this method can be applied and explain how a qualitative method can also be applied to help the Department make the decision
Define the standard error of the mean. What happens to the standard error as the sample size increases? Explain
What is the probability that he will answer all questions correctly?
Determine the standard score for the value x=452 realative to its sample, where the sample mean is 500 and the standard deviation is 32.
If the probability distribution of X is: Determine the expected value of X? Find out the variance of X?
Based on the information in (a), find a one-sided lower 90% confidence limit for m. Also, find a one-sided upper 90% confidence limit for m.
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p-value.
Explain finding value of test statistic and P-value also understand the result. At the .01 significance level can we compute that the mean fare has increased.
Determine the strength of the causal relationship between monthly sales and new home construction by using correlation.
Construct the 95% confidence interval for the proportion of students with at least one injury.
determine if the improvement is of practical significance one should. Crop researchers plant 100 plots with a new variety of corn. The average yield for these plots is x' = 130 bushels per acre
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