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A researcher conductued a study of the access speed of 35 hard drives and concluded that his maximum error of estimate was 35. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives should he include in his new sample?
You know that all sociology majors study 2.5 hours per day with a standard deviation of 1.
Construct a 95% confidence interval for the proportion of all those who experience some type of discomfort.
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level.
What is the null and alternative hypothesis? What is your final conclusion?
Marentette and El-Masri (2011) used logistic regression to identify predictors of obtaining seasonal influenza vaccination among hospital-based nurses in Canada. Their results are shown in table 1:
Determine a 95% confidence interval for true time battery pack can function before having to be recharged.
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
A contractor developed a multiplicative time series model to predict the number of contracts in future quarters, using quarterly data on number of contracts during the 3-year period from 1996 to 1998.
Examine the relationship between final grade and the reported hours per week each student said they studied for the course. Do we have evidence that females are being discriminated against?
Find the value of W, the test statistic for a two sample rank-sum test that would compare the two methods for losing weight. Give the details of how you found W. Please show your step-by-step hand calculation here.
Calculate the test statistic. Determine the p-value of the test-statistic.
Is there a significant difference in the proportions of patients reporting pain relief? Run the test at a 5% level of significance.
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