Hypothesis for a right-tailed test

Assignment Help Basic Statistics

Reference no: EM1394169

To Test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in. The first 25 papers showed a mean score of 77.1 with a standard deviation of 19.6, while the last 24 papers handed in showed a mean score of 69.3 with a standard deviation of 24.9. Is this a significant difference at α = .05? (a) State the hypothesis for a right-tailed test. (b) Obtain a test statistic and p-value assuming equal variances. Interpret these results. (c) Is the difference in mean scores large enough to be important? (d) Is it reasonable to assume equal variances? (e) Carry out a formal test for equal variances at α = .05, showing all steps clearly.

Reference no: EM1394169

Questions Cloud

Explain hydrogen bonds and salt bridges : Briefly explain why hydrogen bonds and salt bridges do not contribute much to protein stability at room temperature.

Standard error calculation : The mean television viewing time for teens is 3 hours per day. Assume the population mean is 3 and the population standard deviation is known to be 1.2 hours.

What policies have created this statistic : Being born to a single mother remains one of the highest risk factors for remaining in poverty. Illustrate what policies have created this statistic.

Critical approach for defective units : Some people who bought X-game gaming systems complained about having received defective systems. The industry standard for such systems has been 98% non-defective systems.

Hypothesis for a right-tailed test : (a) State the hypothesis for a right-tailed test. (b) Obtain a test statistic and p-value assuming equal variances. Interpret these results. (c) Is the difference in mean scores large enough to be important?

Explain how might an industry goals : Explain how might an industry's goals for employee development be related to its goals for innovation also change? To goals for productivity? Can you discuss ways these types of goals might conflict in an organization?

Standard error and variability : How to calculate expected difference between the samples means, and how does larger variability affect the size of the standard error for the sample mean difference?

Question based on osmosis : Recent experiments in a lab have focused on trying to understand cellular mechanisms that underlie epilepsy. Many of the studies involve recording electrical activity in neurons from brains of adult fruit flies

Discuss the roles of nature also nurture : Use at least two (2) quality resources in this assignment. Your textbook may count as one (1) source. At least one (1) of your sources must be obtained from the collection of databases accessible from the Learning Resources Center Web page.

User Account

All Pages