Statistcs for social sience

Weekly ASSIGNMENT #1

Enter your answers in the space provided below. Save the file using your last name as the beginning of the file name (e.g., Krieger_SOCI332_Weekly Assignment 1.doc) and submit via “Assignments.” When appropriate, show your work. You can do the work by hand, scan/take a digital picture, and attach that file with your work.

Mental Math: [10 points]

Read chapters 1, 2, and be sure to go through the SPSS tutorial (or “run the tutorial”).

Without the assistance of SPSS, answer the following questions. Be sure to include ALL of your math:

1. For the data in the following sample:

8, 1, 5, 1, 5

OCI

a. Find the mean, median, and mode

b. Find the standard deviation

c. Now change the score of X=8 to X=18, and find the new mean and standard deviation.

d. Describe how one extreme score influences the mean and the standard deviation

2. A survey of 1,250 people asked how often they used the Internet. 96 responded that they never use it; 214 said they rarely use it; 572 said they use it occasionally, and 368 said they used it all the time.

a. Fill in the table below with the frequencies and percentages for each category.

Remember to create a table whose categories are arranged logically.

INTERNET USAGE	f	%
N =

b. What does N equal? ________________

c. Highlight the level of measurement: Nominal, Ordinal, Interval-Ratio

SPSS Assignment [10 points]

To complete the questions below, follow these guidelines.

To Enter Data:

1. Click on the Variable View tab in the lower left corner of the screen. In the first box under the column Name, type the name you want to give the first variable (i.e., “SCORE1” – NOTE: there are no spaces allowed in the variable name). The name of your variable can be up to eight characters (no spaces a permitted by SPSS in the variable name). When you have completed this, use the down arrow and the mouse to help you name the other variable (i.e., “SCORE2”) in the data set. Do the same for the last variable (“SCORE3”)

2. Once the variable names have been entered, click on the Data View tab in the lower left corner of the screen. Click on the first cell for the first variable (where row 1 and column 1 intersect). Enter the number which corresponds to the data value and hit ENTER or RETURN. Continue this until all of the data has been entered for the first variable, and repeat for the other variable. The box below contains the data you will be entering:

SCORE 1	SCORE 2	SCORE 3
3	34	154
7	54	167
5	17	132
4	26	145
5	34	154
6	25	145
7	14	113
8	24	156
6	25	154
5	23	123

To Construct Frequency Distributions:

Click Analyze.

Go down to Descriptive Statistics.

Go over to Frequencies and click.

Click twice on the variable SCORE1. This will move the variable to the box on the right.

Make sure there is a check mark in the box Display Frequency tables, and click OK.

Follow the same procedure for variable SCORE2 then do the same for SCORE3. Or if you want to be a bit more adventurous, after you have double clicked on the variable SCORE1 (and before you click OK), double click on the variable SCORE2 and SCORE3 then click OK

To Obtain some Basic Descriptive Statistics:

Click Analyze.

Go down to Descriptive Statistics.

Go over to Frequencies and click.

Click twice on all two of the variables. This will move the variables to the box on the right.

Click on the Statistics box.

Under the Central Tendency column, click the boxes next to Mean, Median and Mode.

Under the Dispersion column, click Std. deviation. (You can also select Variance and Range)

Click Continue, and then click OK.

To Move From The Data Window To The Output Window (Or Vice Versa):

Click on Window.

Click on the window you want to view, located at the bottom of this menu.

Export output from SPSS into this file like so:

Statistics
	Score1	Score2	Score3
N	Valid	10	10	10
	Missing	0	0	0
Mean	5.6000	27.6000	144.3000
Std. Error of Mean	.47610	3.53773	5.29161
Median	5.5000	25.0000	149.5000
Mode	5.00	25.00a	154.00
Std. Deviation	1.50555	11.18729	16.73353
Variance	2.267	125.156	280.011
Range	5.00	40.00	54.00
Minimum	3.00	14.00	113.00
Maximum	8.00	54.00	167.00
Sum	56.00	276.00	1443.00
a. Multiple modes exist. The smallest value is shown

To Save the Output File: (Always, ALWAYS save your output files – SPSS doesn’t do it for you and it is completely separate from your data file…also SPSS keeps adding whatever you run to the output file you have open so you don’t need to have multiple output files each week – but you can if that is what you want to do.)

You must first be viewing the output window.

Click File, scroll down to Save, and click – you might want to give it a name such as:

Krieger_SPSS-week1_output

NOW, try it again! Compute the mean, median, mode, and standard deviation for the following data: (don’t forget to open a new ‘window’ in SPSS….click File, then New and choose Data).

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

Import SPSS output here

One more time! Compute the mean, median, mode, standard deviation, variance, and range for the following data. Then answer the questions in the next section.

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

Import SPSS output here

To Quit SPSS:

Click File.

Click Exit.

Click No when asked if you want to save the contents of your data and/or output windows (OF COURSE, say no if you have already done it!).

THE FINAL STEP:

1. Compute the mean, median, mode, and standard deviation for all variables in the dataset. Transfer your answers in the spaces provided below.

SCORE1 SCORE2 SCORE3

Mean _______ ________ _______

Median _______ ________ _______

Mode _______ ________ _______

Standard Deviation _______ ________ _______

HOSPITAL_SIZE INFECTION_RATE

Mean _________ ________

Median _________ ________

Mode _________ ________

Standard Deviation _________ ________

TEST1 TEST2 TEST3

Mean _______ ________ _______

Median _______ ________ _______

Mode _______ ________ _______

Standard Deviation _______ ________ _______

Variance _______ ________ _______

Range _______ ________ _______

For this last set of data, involving a set of three test scores over the course of a semester, answer the following questions:

Which test had the highest average score?

Which test had the smallest amount of variability?

Submit the following files to the Drop Box no later than Sunday of Week 1:

· Word file (this file) saved as Krieger_SOCI332_Weekly Assignment 1.doc

· SPSS output file (.spv) saved as Krieger_SPSS-week1_output

The deadline for this assignment is 11:59 PM EST on Sunday of Week 1