To test the claim using two mean z test

Reference no: EM1315041

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 hypotheses 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: EM1315041

Questions Cloud

Determining estimated population mean : Determine the estimated population mean?

Physiological functions of respiratory system : Explain the general function of Respiratory system and discuss how the Respiratory system contributes to the physiological homeostasis of the human organism?

Mergers and market strategies : Social Dynamo Corporation earned profits last year of $49 million on sales of $500 million. During the same period, its major competitor - EIO Corp.- enjoyed sales of $490 million and earned profits of $52 million.

Computation of common stock dividend : Computation of Common stock dividend - Reiner Wholesale Merchandise had 20,000 shares

To test the claim using two mean z test : Obtain a test statistic and p -value assuming equal variances. Interpret these results.

Explain effect of dividend policy and size of capital budget : Explain Effect of Dividend policy and Size of capital budget on WACC and How might dividend policy affect the WACC

Monopoly and antitrust regulation : Attorneys for Eastman Kodak argued in front of the U.S. Supreme Court to defend the company against charges levied by several independent firms that provide service for machine sold by Eastman Kodak.

Illustrate what ranges of the money growth rate : Illustrate what ranges of the money growth rate (assuming positive values) would allow the Bank of Korea to achieve this objective.

The system is released from rest : A pencil (mass 5.8g and length 8.3cm) is at first balanced so that it is sitting vertically on a flat table. If the pencil then falls, find its angular velocity just before it strikes the tabletop. Assume that the mass of the pencil is distributed un..

User Account

All Pages