Provide a response to the following prompts. Utilize electronic readings for the week and our textbook to help you answer appropriately

TitleABC/123 Version X1
Week 4 Practice WorksheetPSY/315 Version 84

University of Phoenix Material Learning Team:

Week 4 Practice Worksheet

Provide a response to the following prompts. Utilize electronic readings for the week and our textbook to help you answer appropriately.Cite/Reference all sources using proper APA 6th edition format. Citing and referencing our course textbook is REQUIRED on ALL practice worksheets.

Note: Each team member should compute the following questions and submit them to the Learning Team forum. The team should then discuss each team member’s answers to ascertain the correct answer for each question. Once your team has answered all the questions, submit a finalized team worksheet.

1. Two boats, the Prada (Italy) and the Oracle (USA), are competing for a spot in the upcoming America’s Cup race. They race over a part of the course several times. The sample times in minutes for the Prada were as follows: 12.9, 12.5, 11.0, 13.3, 11.2, 11.4, 11.6, 12.3, 14.2, and 11.3. The sample times in minutes for the Oracle were as follows: 14.1, 14.1, 14.2, 17.4, 15.8, 16.7, 16.1, 13.3, 13.4, 13.6, 10.8, and 19.0. For data analysis, the appropriate test is the t test: two-sample assuming unequal variances.

Hypothesis Test: Independent Groups (test, unequal variance)
PradaOracle
12.17014.875mean
1.0562.208std. dev.
1012n
20df
-2.7050difference (Prada – Oracle)
0.7196standard error of difference
0hypothesized difference
-3.76t
.0017p-value (two-tailed)
-4.2304confidence interval 95% lower
-1.1796confidence interval 95% upper
1.5254margin of error

The previous table shows the results of this independent test. At the .05 significance level, can you conclude that there is a difference in their mean times? Explain these results to a person who knows about the t test for a single sample but who is unfamiliar with the ttest for independent means.

2. The Willow Run Outlet Mall has two Haggar Outlet Stores, one located on Peach Street and the other on Plum Street. The two stores are laid out differently, but both store managers claim their layout maximizes the amounts customers will purchase on impulse. A sample of 10 customers at the Peach Street store revealed they spent the following amounts more than planned: $17.58, $19.73, $12.61, $17.79, $16.22, $15.82, $15.40, $15.86, $11.82, $15.85. A sample of 14 customers at the Plum Street store revealed they spent the following amounts more than they planned when they entered the store: $18.19, $20.22, $17.38, $17.96, $23.92, $15.87, $16.47, $15.96, $16.79, $16.74, $21.40, $20.57, $19.79, $14.83. For data analysis, a t test: two-sample assuming unequal variances was used.

Hypothesis Test: Independent Groups (test, unequal variance)
Peach StreetPlum Street
15.868018.2921mean
2.33062.5527std. dev.
1014n
20df
-2.42414difference (Peach Street – Plum Street)
1.00431standard error of difference
0hypothesized difference
-2.41t
.0255p-value (two-tailed)
-5.28173confidence interval 99.% lower
0.43345confidence interval 99.% upper
2.85759margin of error

At the .01 significance level, is there a difference in the mean amount purchased on an impulse at the two stores? Explain these results to a person who knows about the t test for a single sample but who is unfamiliar with the test for independent means.

3. Fry Brothers Heating and Air Conditioning, Inc. employs Larry Clark and George Murnen to make service calls to repair furnaces and air conditioning units in homes. Tom Fry, the owner, would like to know whether there is a difference in the mean number of service calls they make per day. Assume the population standard deviation for Larry Clark is 1.05 calls per day, and 1.23 calls per day for George Murnen. A random sample of 40 days last year showed that Larry Clark made an average of 4.77 calls per day. For a sample of 50 days, George Murnen made an average of 5.02 calls per day.

Hypothesis Test: Independent Groups (test, pooled variance)
LarryGeorge
4.775.02mean
1.051.23std. dev.
4050n
88df
-0.25000difference (Larry – George)
1.33102pooled variance
1.15370pooled std. dev.
0.24474standard error of difference
0hypothesized difference
-1.02t
.3098p-value (two-tailed)
-0.73636confidence interval 95.% lower
0.23636confidence interval 95.% upper
0.48636margin of error

At the .05 significance level, is there a difference in the mean number of calls per day between the two employees? What is the p-value?

4. An organizational psychologist measures levels of job satisfaction in a sample of 30 participants. To measure the variance of job satisfaction, it is calculated that the SS = 120 for this sample.

a. What are the degrees of freedom for the variance?

b. Compute the variance and standard deviation (you will have to do this one by hand).

References

Copyright © XXXX by University of Phoenix. All rights reserved.

Copyright ©2013 by Pearson Education, Inc.  All rights reserved.  Used with permission.

“Get 15% discount on your first 3 orders with us”
Use the following coupon
FIRST15

Order Now