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  PSY340: Statistics for the Social Sciences

Lab 15:

 

Part I: Solve perform all of the following problems using SPSS. Even though you are using SPSS also go through the same 5 steps of hypothesis testing. Make sure to check the decision tree to determine which test is the appropriate test (For all tests, assume an alpha level of 0.05 and a two-tailed test).

    1) A researcher tests 10 individuals before and after an experimental procedure. The results were as follows:
    ParticipantBeforeAfter
    110.410.8
    212.612.1
    311.212.1
    410.911.4
    514.313.9
    613.213.5
    79.710.9
    811.511.5
    910.810.4
    1013.112.5

    2) A researcher randomly assigns 43 individuals to either an experimental procedure or a control condition. The results were as follows:
    Experimental
    group    		Control
    group
    36.923.5
    34.622.5
    26.436.4
    33.340.0
    35.430.6
    34.830.5
    32.334.5
    34.531.3
    36.019.4
    24.529.6
    31.624.8
    36.125.0
    36.828.8
    27.932.5
    34.433.3
    33.829.6
    36.924.5
    34.4
    31.7
    29.4
    34.1
    18.2
    34.5
    35.3
    35.5
    33.4

    3) A researcher belives that the local residents are different from the general population (which has a mean of 3.8). He collects ratings from 10 individuals from the local area. The results were as follows:
    Ratings
    5
    3
    6
    2
    7
    6
    7
    4
    2
    5

Part II: using the majors.sav datafile. Test the following research questions (state your hypotheses, conclusions, and which test you use. Assume an alpha level 0.05).

1) Test whether men and women differ on their SAT math scores.

2) Test whether the means of SAT math and verbal scores differ from each other.

3) Test whether the sample has a university gpa different than 2.5.

Solutions
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