PSYCH/625 Statistics Assignment

PSYCH/625 Statistics Assignment

PSYCH/625 Statistics Assignment

University of Phoenix Material

Time to Practice: Week 1

Complete both Part A and Part B 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 through the Textbook Resources link.

If you paste in SPSS output, highlight the required answers to the question.

1. By hand or using SPSS, compute the mean, median, and mode for the following set of 40 reading scores:

SUMMARY

31	32	43	42
24	34	25	44
23	43	24	36
25	41	23	28
14	21	24	17
25	23	44	21
13	26	23	32
12	26	14	42
14	31	52	12
23	42	32	34

2. Compute the means for the following set of scores using IBM® SPSS® software. The data sets can be found through the Sage Materials in the Student Textbook Resource Access link, listed under Academic Resources. The following set of scores is saved as Ch. 2 Data Set 3. Copy and paste the output from IBM® SPSS® into this worksheet. You will have a mean for Bed number and also for infection rate.

Hospital size (number of beds)	Infection rate (per 1,000 admissions)
234	1.7
214	2.4
165	3.1
436	5.6
432	4.9
342	5.3
276	5.6
187	1.2
512	3.3
553	4.1

3. You are the manager of a fast food store. Part of your job is to report which special is selling best to the boss at the end of each day. Use your knowledge of descriptive statistics and write one paragraph to let the boss know what happened today. Use the following data. Do not use IBM® SPSS® software to compute the statistics needed; rather, do it by hand. You may check your work in SPSS after you compute it.

Special number	Sold	Cost
Huge Burger	20	$2.95
Baby Burger	18	$1.49
Chicken Littles	25	$3.50
Porker Burger	19	$2.95
Yummy Burger	17	$1.99
Coney Dog	20	$1.99
Total specials sold	119

4. Suppose you are working with a data set that has some different (much larger or much smaller than the rest of the data) scores. What measure of central tendency (mean, median or mode) would you use and why?

5. Use IBM® SPSS® software to compute all the descriptive statistics for the following set of three test scores over the course of a semester. Which test had the highest average score? Which test had the smallest amount of variability?

Test 1	Test 2	Test 3
50	50	49
48	49	47
51	51	51
46	46	55
49	48	55
48	53	45
49	49	47
49	52	45
50	48	46
50	55	53

6. This practice problem uses the data contained in the file named Ch. 3 Data Set 3. There are two variables in this data set. The data sets can be found through the Sage Materials in the Student Textbook Resource Access link, listed under Academic Resources. Using IBM® SPSS® software, compute all of the measures of variability you can for height and weight. Copy and paste the output from IBM® SPSS® into this worksheet.

Variable	Definition
Height	Height in inches
Weight	Weight in pounds

7. Identify whether these distributions are negatively skewed, positively skewed, or not skewed at all and why.

a. This talented group of athletes scored very high on the vertical jump task.

b. On this incredibly crummy test, everyone received the same score.

c. On the most difficult spelling test of the year, the third graders wept as the scores were delivered.

8. For each of the following, indicate whether you would use a pie, line, or bar chart, and why.

a. The proportion of freshmen, sophomores, juniors, and seniors in a particular university

b. Change in GPA over four semesters

c. Number of applicants for four different jobs

d. Reaction time to different stimuli

e. Number of scores in each of 10 categories

From Salkind (2014). Copyright © 2014 SAGE. All Rights Reserved. Adapted with permission.

Part B

Answer the questions below. Be specific and provide examples when relevant.

Cite any sources consistent with APA guidelines.

Question	Answer
What are statistics and how are they used in the behavioral sciences? Your answer should be 100 to 175 words.
Differentiate between descriptive and inferential statistics. What information do they provide? What are their similarities and differences? Your answer should be 175 to 350 words.
What is a population? What is a sample? How are they similar and how are they different? When would you use one or the other? Your answer should be 175 to 350 words.