PSY 315 Week 4 Practice Problem Worksheet (Version 7)
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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: twosample assuming unequal variances.
The next table shows the results of this independent t 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 t test for independent means.

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: twosample assuming unequal variances was used.
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 t test for independent means.
 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. At the .05 significance level, is there a difference in the mean number of calls per day between the two employees? What is the pvalue?
Chapters 11 & 12
 A consumer organization wants to know if there is a difference in the price of a particular toy at three different types of stores. The price of the toy was checked in a sample of five discount toy stores, five variety stores, and five department stores. The results are shown below.
An ANOVA was run and the results are shown below. At the .05 significance level, is there a difference in the mean prices between the three stores? What is the pvalue? Explain why an ANOVA was used to analyze this problem.
 A physician who specializes in weight control has three different diets she recommends. As an experiment, she randomly selected 15 patients and then assigned 5 to each diet. After three weeks the following weight losses, in pounds, were noted. At the .05 significance level, can she conclude that there is a difference in the mean amount of weight loss among the three diets?
An ANOVA was run and the results are shown below. At the .01 significance level, is there a difference in the weight loss between the three plans? What is the pvalue? What can you do to determine exactly where the difference is?
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If anxiety and depression are correlated, what three possible directions of causality might explain this correlation?
..

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What is a correlation? What are the different types of correlation research? Why is it important to determine correlation? How is the strength of a correlation determined?
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1. Learning Team Assignment: Hypothesis Testing Paper
Resources: Assigned readings, ERRs, the Internet, and other sources
Select a research issue, problem, or opportunity in the field of psychology.
Obtain instructor appro..

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What is the theory underlying the ANOVA? Why is it important? What are the differences between a two sample ttest and ANOVA hypothesis testing? What is an example of a research idea that would need to be analyzed using an ANOVA?
..

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What is a tTest? How is the tTest different from what we learned last week? What is the normal distribution and how does it relate to the ttest? What is an example of a situation in which you would use a t Test for dependent means?
..

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What is the difference between null and alternative hypotheses statements in onetailed and twotailed tests? What are significance/alpha levels and how does using a one versus a two tailed test affect significance levels?
..

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What are some terms related to hypothesis testing with which you are already familiar? What are the five steps of hypothesis testing? Why do the null and alternative hypotheses have to be mutually exclusive?
..

PSY 315 Week 2 Learning team assignment Descriptive and Inferential Statistics Paper andTeam Charter
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1. Learning Team Assignment:Descriptive and Inferential Statistics Paper & Team Charter: see Rubric in the Course MaterialsForum, Also post the team charter to the Assignments section with the completed assignment.
Resources: Assigned readings, ERR..

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How effective are the pie charts that often accompany a newspaper article in explaining the statistics being used in the article? Can you find an example of a pie chart?
..

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The median home price in your area has increased in the last 10 years, how does this differ from the mean home price in your area? How does this illustrate what the mean and median are?
..

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1. Individual Assignment: Research, Statistics, and Psychology Paper
Resources: Assigned readings, ERRs, the Internet, and other sources
Prepare a 700 to 1,050word paper in which you examine the role of research and statistics in the field of psychology.
..

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What are descriptive statistics, and how might you use descriptive statistics in your personal life?
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What are the differences between quantitative and qualitative data? What are some examples of each?
..

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Provide a response to the following questions.
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 ans..

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Resource: Instructor approved research issue, problem, or opportunity in the field of psychology
Prepare a 1,400 to 1,750word paper in which you formulate a hypothesis based on your selected research issue, problem, or opportunity.
Address the following:
Describe your selected r..

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Chapter 7
The table below shows ratings of various aspects of work and home life of 100 middleclass men in India who were fathers. Pick three rows of interest to you and explain the results to someone who is familiar with the mean, variance, and Z scores, but knows nothing els..

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Prepare a 7 to 10slide Microsoft PowerPoint Presentation with speaker notes, as a lesson to explain the null and alternative hypothesis and how to use a ztest to test the null hypothesis.
Provide an example to illustrate your lesson.
Include a minimum of 12 peer..

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Resource:Statistics for Psychology
Complete the Week Three Practice Problems Worksheet.
Click the assignment files tab to submit your assignment.
Note. Methods of computation may include the usage of Microsoft® Excel®, SPSS™, Lotus®, SAS®, Minitab®, or byh..

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Resource: Assigned journal article
Create a 7 to 10slide presentation with speaker notes examining the differences between descriptive and inferential statistics used in the journal article you were assigned.
Address the following items as they apply to the article:
Describe the..

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Resource:Statisticsfor Psychology
Complete the Week Two Practice Problems Worksheet.
Click the Assignment Files tab to submit your assignment.
Note. Computation methods may include the use of Microsoft® Excel®, SPSS™, Lotus®, SAS®, Minitab®, or byhand..

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Resource:Statisticsfor Psychology
Complete the Week One Practice Problems Worksheet.
Click the Assignment Files tab to submit your assignment.
Note. Computation methods may include the use of Microsoft® Excel®, SPSS™, Lotus®, SAS®, Minitab®, or byhand..

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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 sam..

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. On a standard measure of hearing ability, the mean is 300, and the standard deviation is 20. Provide the Z scores for persons whose raw scores are 340, 310, and 260. Provide the raw scores for persons whose Z scores on this test are 2.4, 1.5, and 4.5.
2.&nb..

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Create a 12 to 15slide presentation using the information you gathered and submitted in Weeks 3 & 4. Include the following:
Describe the problem, and provide some brief background about the situation.
Explain the research hypothesis.
Descri..

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Analyze the data from Part 1 using Microsoft® Excel® software.
Write a 700 to 875word paper that includes the following information:
Describe what method you are using to compare groups.
Copy and paste the output into a Microsoft® Word document, and also answe..

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Select one of the following scenarios based on your particular field of interest in psychology:
Industrial/Organizational Psychology:
A few months ago, the upper management at a large corporation decided they wanted to make major changes in the organization. Lea..

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Provide a response to the following questions. Written responses should be at least 30 to 45 words each.
1. Explain and provide an example for each of the following types of variables:
a. &n..
