examine the distributions of the sample data, Basic Statistics

A second file on DocDepot named Marks.mtp contains the final exam percentages of students in ADM2304A in the Fall 2011 semester. Assume that the class can be considered a random sample from the population of commerce students.

The Attend variable is coded as follows:
Attend = 0 if the student came to class less than 70% of the time
Attend = 1 if the student came to class more than 70% of the time

(a) Examine the distributions of the sample data to determine if the 2 sample t-test is valid.

(b) Assuming unequal population variances, test whether there is a difference in average final exam marks between the two groups in the population. Use the critical value approach and the .01 level of significance. Perform the test manually after using Minitab to summarize the data and/or to calculate the degrees of freedom.

(c) Now manually find or calculate the p-value for your sample result.

(d) Finally calculate manually the 99% confidence interval for the true difference between the two population means.

(e) Explain how the results in (c) and (d) are consistent with your conclusion in (b).

(f) If the 2-sample t-test were not valid, then identify another test you could use. Explain.

Posted Date: 3/26/2013 6:57:36 AM | Location : United States







Related Discussions:- examine the distributions of the sample data, Assignment Help, Ask Question on examine the distributions of the sample data, Get Answer, Expert's Help, examine the distributions of the sample data Discussions

Write discussion on examine the distributions of the sample data
Your posts are moderated
Related Questions
#A________variable is a variable whose values are countable.

Post-retirement health insurance Some companies continue to provide insurance policy to workers after they have on. This one person benefit is considered to be part of the sett

Consider an economy specified by the following:       Y = PE = C + I + G + NX                            (Income identity)       C = 400 + 0.9YD

Bonds payable The face worth of bonds issued and honorary. In the case of zero-coupon bonds, however, and the only and the accreted value of the tie is reported as bonds owed on t

16 people to line-up ( 12 boys 4 girls). in how many ways could they line-up with all 4 girls in last (anyorder)?

difference b/w historigrams & histogram?

Q. How to Choose a Sample? The way a sample is chosen is extremely important in all statistical studies. This is because, ultimately, all the inferences will be based on the s

A group of identical synchronous motors is connected through a transformer to a 4.16-kV bus at a remote location from the generating plants of a power system. The motors are rated


writing a Introduction on Metaphor