Download Homework1

PSYC 3020.3 (.2 on portal)
Homework #1
1. A group of weightlifters were randomly tested for steroid use. The following table
displays the results of the drug test and the amount of weight in pounds the weightlifters
were able to bench press and leg press. Using SPSS, create a data matrix for each of
your variables with both variable names and labels provided below and enter all the
values. On the dtest variable be sure to enter values 1 = positive and 2 = negative as
you did for the gender variable in the lab example. Save your dataset as weightlifters
and turn in with homework or provide a printout of your data with your homework.
Participant
number
(pnum)
1
2
Drug test
result
(dtest)
positive
negative
3
4
5
6
7
8
9
10
positive
positive
negative
negative
positive
negative
negative
positive
Bench
press
(bench)
425
470
445
500
415
430
439
452
428
480
11
12
positive
negative
465
250
Leg
press
(leg)
725
615
680
625
535
515
620
670
640
715
720
440
Next create descriptive statistics for the bench and leg variables (analyze>descriptive
statistics>descriptives). Move bench and leg into the variable box. Click the button for
options and click mean and standard deviation and continue. Click continue and then OK.
Describe the descriptive statistics for each variable. Say where the center of the scores lie,
how grouped around the middle the scores are (high or low variability), and be sure to
specify which variables you are referring to, and their corresponding metric (i.e. “On
average participants bench pressed 300 lbs).
PSYC 3020.3 (.2 on portal)
2. Open the breakfast.sav dataset that we used for the class presentation (it can be found
on the class portal under course materials). Create a histogram of the frequency
distribution for the poptart variable (analyze/descriptive statistics/frequencies). Move
poptart to the variable box. Be sure to include the mean and standard deviation
(statistics/click mean and standard deviation/continue) and a historgram
(charts/histogram). Click ok. Describe the shape of the distribution using the output from
above and describe the pattern of poptart consumption among this sample. Considering
the available response options (values in variable view for reminder), are there any that
are not represented? If yes, why might that be?