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(Solved) PSYC 354 HOMEWORK 3 Central Tendency and Variability When submitting this file, be sure the filename includes your full name, course and section....

OMG!!!!! Hello, I need help with starting with part 3 of the hw. I do not know how to enter this data to get answers and I'm confused as hell. PLEASE HELP!!!! I need answers. I need to be able to do this on my own as well!!!!

PSYC 354 HOMEWORK 3

Central Tendency and Variability

When submitting this file, be sure the filename includes your full name, course and section.

Example: HW3_JohnDoe_354B01

Be sure you have reviewed this module/weekâ€™s lesson and presentations along with the practice

data analysis before proceeding to the homework exercises. Complete all analyses in SPSS, then

copy and paste your output and graphs into your homework document file. Answer any written

questions (such as the text-based questions or the APA Participants section) in the appropriate

place within the same file. Questions 1â€“7 Part I: Concepts These questions are based on the Nolan and Heinzen reading

and end-of-chapter questions. Questions 1-4

Fill in the highlighted blanks to answer/complete the statements. 1

) Another name for the arithmetic average of a set of numbers is the _mean_______.

Name the three measures of central tendency covered in Chapter 4 of Nolan and Heinzen

(2016). 2) 1._range ___

____ 3

)

4

) 2. variance and 3. Standard deviation According to the text and presentation, which measure of central tendency is most likely

to be negatively affected by outliers?

__mean______

Which measure of variability is defined as the typical amount that each score varies from

the mean? _Standard deviation_______ Question 5a-5d

For the following terms, write the equivalent mathematical symbol (letter or letters) for the

sample statistic.

5-a) Score: X Page 1 of 9 PSYC 354 5-b) Mean: M 5-c) Standard deviation: SD 5-d) Number of participants in sample: N Question 6a-6c

These are the scores of eleven patients on the Beck Depression Inventory (BDI Â® ). Scores can

range from 0 to 63. 1

0 19 6 8 14 16 26 25 54 12 20 6-a) What is the mean of the scores? (Compute this using a calculator):

19.09

6-b) What is the median of these scores?

16

6-c ) Compare the mean and median. Does the difference between them suggest that the

data are skewed positively, skewed negatively, or symmetrical?

Explain.

Skewed Positivily

There is an extreme score, 54. This creates an outlier. The difference between the 2 make it

positively skewed. Page 2 of 9 PSYC 354 Question 7a- 7f At this website, (http://projects.newyorker.com/story/subway/) you will find an interactive graph

concerning New York Cityâ€™s geography and income.

Read the introduction and click on different â€œsubway linesâ€ to see how the interactive graph works.

Note that the abbreviations stand for the four different boroughs: MAN = Manhattan BRX = Bronx BRK = Brooklyn QNS = Queens

Also note that hovering your mouse over the dots on the graph displays the subway stop and the

median income of households in that area. 7-a) Click on Line 5. In which of the boroughs shown is the median household income highest?

MAN

7-b) Click on the â€œCâ€ line. Does the line graph for Manhattan show high or low variability? What

does this level of variability tell us about the household income in this area of Manhattan?

High Variability

Wide difference in income

7-c) Click on Line 6. Though both boroughs depicted show some variability, which borough (not a

street) shows the least variability in median household income?

BRX

7-d) On Line 2, find the following two subway stops: Park Place (the first of the two highest

Manhattan stops) and 149 St.-Grand Concourse (the first of the Bronx stops). What is the difference

(calculate) between the median household incomes of the two areas?

188,612

7-e)

Click on Line 5. Which subway stop in Manhattan seems to be an outlier?

125th St.

7-f) Based on this module/weekâ€™s reading, why do you think the author of this graph chose the

median household income instead of the mean household income to describe the central tendency of this

data?

Household income provided a better sense of central tendency of a distribution Page 3 of 9 PSYC 354 Part II: SPSS Analysis Green and Salkind Course Text, Lesson 21: Exercises 1 and 4 Questions 1 and 4

o Green and Salkind Text, Lesson 21

o Lesson 21 Exercise File 1 (located under courseâ€™s Assignment Instructions

folder) Part II:

Exercises 1a-1d and Exercise 4

Green and Salkind, Lesson 21, Exercises 1 and 4 ( do not complete numbers 2 or 3)

Open â€œLesson 21 Exercise File 1â€ in order to complete these exercises.

David collects anxiety scores from 15 college students who visit the university health center

during finals week:

1) Compute descriptive statistics on the anxiety scores.

From the output, identify the following:

a. Skewness

b. Mean

c. Standard deviation

d. Kurtosis Page 4 of 9 PSYC 354 Descriptives

Statistic

Anxiety Scores Mean Std. Error 32.27 95% Confidence Interval for Lower Bound 19.27 Mean Upper Bound 45.27 5% Trimmed Mean 31.24 Median 25.00 Variance

Std. Deviation 551.210

23.478 Minimum 5 Maximum 78 Range 73 Interquartile Range 40 Skewness

Kurtosis 6.062 .416 .580 -1.124 1.121 1-a) Skewness:

.416

1-b) Mean:

32.37

1-c) Standard deviation:

23.478

1-d) Kurtosis:

-1.124

Create a histogram to show the distribution of the anxiety scores.

4)

Edit the graph so that most of the normal curve is visible. Page 5 of 9 PSYC 354 Page 6 of 9 PSYC 354 Part III: SPSS Data Entry and Analysis Data provided below. The steps will be the same as the ones you have been practicing in Part I of

the assignment; the only difference is that you are now responsible for

creating the data file, as well. Remember to do the following:

a) Name and define your variables under the Variable View, then return

to the Data View to enter the data; and

b) Paste all SPSS output and graphs into your homework file at the

appropriate place. Part III:

Questions 1-4

The following data are based on numbers taken from the Bureau of Labor Statistics surveys

from the years 2009â€“2013, with some modifications. They represent the average weekly pay

for wage and salary earners measured at 4 different quarters each year and broken down by

gender. Enter these data into a new file containing one variable for gender and one variable for

salary. For the gender variable in column 1, code women as 1 and men as 2

o Remember to define these in Value Labels as covered in presentations since

Module 1.

o There will be twenty â€œ1â€s and twenty â€œ2â€s (as many participants as in each

group). The corresponding earnings will be entered in the salary column (second column). If you need an example, look at the set-up of gender in the â€œLesson 21 Practice Data

File 1â€ document.

Women

Men 1) 749

785

925

930 754 752 775 760 767 775 768 781 771

792 776 789 783 700 792 788 788 694

918 913 931 922 951 915 916 933 927

928 933 946 937 951 968 931 981 954 In SPSS, compute descriptive statistics for each gender for these data.

The necessary steps are covered in the last 3 slides of this moduleâ€™s SPSS tutorial. Answer- SPSS Table- Descriptive Statistics for Weekly Pay by Gender:

(Paste one table; should include weekly pay grouped by men and women) Page 7 of 9 PSYC 354 Create a boxplot describing the average overall weekly salary for each gender.

Answer- SPSS boxplot: 2) 3) Based on these data, what is the mean weekly income for men? Answer 4) What is the standard deviation of the weekly income for women? Answer Part IV: Cumulative

Questions 1-4 1) The BDI (Beck et al., 1961) is an instrument

widely used to assess levels of depression in

individuals in a variety of settings. The scores range from 0â€“63 (whole numbers

only). A researcher administers the BDI to a sample

of college students. The results appear in the

table below. They are entered as two columns to save

space (i.e., you will not need two columns in

the SPSS file, only one). BDI Scores

9

10

9

5

8

3

11

20

11

62 15

12

10

4

61

61

20

15

10

11 Using SPSS, run a frequencies analysis on these scores that includes: A Frequency Table Table of Descriptive Statistics

o Include measures of central tendency, variability/spread, and

distribution shape. Paste the output into your homework file. Answer- SPSS Table- Frequency Table for BDI Scores: Page 8 of 9 PSYC 354 Answer- SPSS Table- Descriptive Statistics for BDI Scores (Include measures of central

tendency, variability/spread, and distribution shape):

Create a graph to describe the data set.

Justify why this graph is the best choice for these data.

Answer- SPSS graph 2) Explanation/ Justification

Based on your SPSS output, what is the numerical skewness value of this data

3) set?

What does this value say about how the scores are distributed?

Answer

Explanation 4) Based on your graph and your answers above, which measure of central

tendency is most appropriate for describing this group of scores?

Why? Answer

Explanation/Rationale

Submit Homework 3 by 11:59 p.m. (ET) on Monday of Module/Week 3. Remember to name file

appropriately. Done! Page 9 of 9

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