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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/week’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 1–7 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 ® ). 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 City’s geography and income.
Read the introduction and click on different “subway lines” 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 “C” 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/week’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 course’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 “Lesson 21 Exercise File 1” 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 2009–2013, 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 “1”s and twenty “2”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 “Lesson 21 Practice Data
File 1” 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 module’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 0–63 (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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