University of Phoenix Material
Time to Practice – Week Two
Complete Parts A, B, and C below.
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.
1. Why is a z score a standard score? Why can standard scores be used to compare scores from different distributions?
2. For the following set of scores, fill in the cells. The mean is 70 and the standard deviation is 8.
Raw score 
Z score 
68.0 
? 
? 
–1.6 
82.0 
? 
? 
1.8 
69.0 
? 
? 
–0.5 
85.0 
? 
? 
1.7 
72.0 
? 
3. 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.
a. What is the probability of a score falling between a raw score of 70 and 80?
b. What is the probability of a score falling above a raw score of 80?
c. What is the probability of a score falling between a raw score of 81 and 83?
d. What is the probability of a score falling below a raw score of 63?
4. 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?
5. 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 
Zscores 




Math score 
Reading score 
Average 
Noah 



Talya 



6. Using IBM^{®} SPSS^{®} software, conduct a frequency analysis on the gender and marital status variables. From the output, identify the following:
a. Percent of men
b. Mode for marital status
c. Frequency of divorced people in the sample
7. 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.
8. 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:
a. Skewness
b. Mean
c. Standard deviation
d. Kurtosis
Complete the questions below. Be specific and provide examples when relevant.
Cite any 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 z score 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? 


At 111papers.com, we value all our customers, and for that, always strive to ensure that we deliver the best topquality content that we can. All the processes, from writing, formatting, editing, and submission is 100% original and detailoriented. With us, you are, therefore, always guaranteed quality work by certified and experienced writing professionals. We take pride in the university homework help services that we provide our customers.
As the best homework help service in the world, 111 Papers ensures that all customers are completely satisfied with the finished product before disbursing payment. You are not obligated to pay for the final product if you aren’t 100% satisfied with the paper. We also provide a moneyback guarantee if you don’t feel that your paper was written to your satisfaction. This guarantee is totally transparent and follows all the terms and conditions set by the company.
Read moreAll products that we deliver are guaranteed to be 100% original. We check for unoriginality on all orders delivered by our writers using the most advanced antiplagiarism programs in the market. We, therefore, guarantee that all products that we submit to you are 100% original. We have a zerotolerance policy for copied content. Thanks to our strict no plagiarized work rule, you can submit your homework to your professor without worrying.
Read moreTThis is one of the most cherished courtesy services that we provide to help ensure that our customers are completely satisfied with our finished products. Delivering the best final product to our customers takes multiple inputs. 111papers.com prides itself on delivering the best university homework help services in the writing industry. And, in part, our free revision policy is how we do it. What’s more, all our revisions are 100% free without any strings attached.
Read moreClient privacy is important to use. We know and understand just how important customers value their privacy and always want to safeguard their personal information. Thus, all the information that you share with us will always remain in safe custody. We will never disclose your personal information to any third party or sell your details to anyone. 111 Papers uses the most sophisticated, topoftheline security programs to ensure that our customers’ information is safe and secured.
Read morePlacing your order with us means that you agree with the homework help service we provide. We, in turn, will endear to ensure that we do everything we can to deliver the most comprehensive finished product as per your requirements. We will also count on your cooperation to help us deliver on this mandate. Yes, we also need you to ensure that you have the highestquality paper.
Read more