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## Comparison Scores from Different Distributions

Order ID:89JHGSJE83839Style:APA/MLA/Harvard/ChicagoPages:5-10

Instructions:Comparison Scores from Different Distributions

Time to Practice – Week Two

CompleteParts A, B, and C below.Part A

Some questions in Part A require that you access data from

Statistics for People Who (Think They) Hate Statistics.This data is available on the student website under the Student Text Resources link.

- Why is a
zscore a standard score? Why can standard scores be used to compare scores from different distributions?

- For the following set of scores, fill in the cells. The mean is 70 and the standard deviation is 8.

Raw score Zscore68.0 ? ? –1.6 82.0 ? ? 1.8 69.0 ? ? –0.5 85.0 ? ? 1.7 72.0 ?

- Questions 3a through 3d are based on a distribution of scores with and the standard deviation = 6.38. Draw a small picture to help you see what is required.

- What is the probability of a score falling between a raw score of 70 and 80?
- What is the probability of a score falling above a raw score of 80?
- What is the probability of a score falling between a raw score of 81 and 83?
- What is the probability of a score falling below a raw score of 63?

- Jake needs to score in the top 10% in order to earn a physical fitness certificate. The class mean is 78 and the standard deviation is 5.5. What raw score does he need?

- Who is the better student, relative to his or her classmates? Use the following table for information.

Math Class mean 81 Class standard deviation 2 Reading Class mean 87 Class standard deviation 10 Raw scores Math score Reading score Average Noah 85 88 86.5 Talya 87 81 84 Z-scoresMath score Reading score Average Noah Talya

From Salkind (2011). Copyright © 2012 SAGE. All Rights Reserved. Adapted with permission.

Part B

Some questions in Part B require that you access data from Using SPSS for Windows and Macintosh. This data is available on the student website under the Student Text Resources link.

The data for Exercises 6 and 7 are in thedata file named Lesson 20 Exercise File 1. Answer Exercises 6 and 7 based on the following research problem:

Ann wants to describe the demographic characteristics of a sample of 25 individuals who completed a large-scale survey. She has demographic data on the participants’ gender (two categories), educational level (four categories), marital status (three categories), and community population size (eight categories).

- Using IBM
^{®}SPSS^{®}software, conduct a frequency analysis on the gender and marital status variables. From the output, identify the following:

- Percent of men
- Mode for marital status
- Frequency of divorced people in the sample

- Using IBM
^{® }SPSS^{® }software, create a frequency table to summarize the data on the educational level variable.

The data for Exercise 8 is available in the data file named Lesson 21 Exercise File 1.

- David collects anxiety scores from 15 college students who visit the university health center during finals week. Compute descriptive statistics on the anxiety scores. From the output, identify the following:

- Skewness
- Mean
- Standard deviation
- Kurtosis

From Green & Salkind (2011). Copyright © 2012 Pearson Education. All Rights Reserved. Adapted with permission.

Part C

Completethe questions below. Be specific and provide examples when relevant.

Citeany sources consistent with APA guidelines.

Question Answer What is the relationship between reliability and validity? How can a test be reliable but not valid? Can a test be valid but not reliable? Why or why not? How does understanding probability help you understand statistics? How could you use standard scores and the standard distribution to compare the reading scores of two students receiving special reading resource help and one student in a standard classroom who does not get special help? In a standard normal distribution: What does a zscore of 1 represent? What percent of cases fall between the mean and one standard deviation above the mean? What percent fall between the mean and –1 to +1 standard deviations from the mean? What percent of scores will fall between –3 and +3 standard deviations under the normal curve?Comparison Scores from Different Distributions

Comparison Scores from Different Distributions

RUBRIC

Excellent Quality95-100%

Introduction45-41 points

The background and significance of the problem and a clear statement of the research purpose is provided. The search history is mentioned.

Literature Support91-84 points

The background and significance of the problem and a clear statement of the research purpose is provided. The search history is mentioned.

Methodology58-53 points

Content is well-organized with headings for each slide and bulleted lists to group related material as needed. Use of font, color, graphics, effects, etc. to enhance readability and presentation content is excellent. Length requirements of 10 slides/pages or less is met.

Average Score50-85%

40-38 points

More depth/detail for the background and significance is needed, or the research detail is not clear. No search history information is provided.

83-76 points

Review of relevant theoretical literature is evident, but there is little integration of studies into concepts related to problem. Review is partially focused and organized. Supporting and opposing research are included. Summary of information presented is included. Conclusion may not contain a biblical integration.

52-49 points

Content is somewhat organized, but no structure is apparent. The use of font, color, graphics, effects, etc. is occasionally detracting to the presentation content. Length requirements may not be met.

Poor Quality0-45%

37-1 points

The background and/or significance are missing. No search history information is provided.

75-1 points

Review of relevant theoretical literature is evident, but there is no integration of studies into concepts related to problem. Review is partially focused and organized. Supporting and opposing research are not included in the summary of information presented. Conclusion does not contain a biblical integration.

48-1 points

There is no clear or logical organizational structure. No logical sequence is apparent. The use of font, color, graphics, effects etc. is often detracting to the presentation content. Length requirements may not be met

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