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SPSS Dataset SPSS Data for HW (500 cases).sav (available in Canvas) Variable Names in the dataset...

SPSS Dataset

SPSS Data for HW (500 cases).sav (available in Canvas)

Variable Names in the dataset

group: Group assignment (new vs. routine treatment)

sbi: Number of serious behavioral incidents

State the research hypothesis (non-directional) and the null hypothesis. Make sure you include both DV and IV.)

Group Statistics

Treatment

N

Mean

Std. Deviation

Std. Error Mean

Number of serious behavioral incidents

New treatment

250

6.00

7.546

.477

Routine treatment

250

5.00

1.299

.082

Independent Samples Test

Levene's Test for Equality of Variances

t-test for Equality of Means

F

Sig.

t

df

Sig. (2-tailed)

Mean Difference

Std. Error Difference

95% Confidence Interval of the Difference

Lower

Upper

Number of serious behavioral incidents

Equal variances assumed

374.402

.000

2.065

498

.039

1.000

.484

.048

1.952

Equal variances not assumed

2.065

263.737

.040

1.000

.484

.046

1.954
Math   Statistics-And-Probability   
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Homework Answers

Answer #1

Null hypothesis:

The number of serious behavioral incidents is same for New treatment and Routine treatment i.e. New Treatment has the same effect on the number of serious behavioral incidents as Routine treatment.

Alternative hypothesis(non-directional):

The number of serious behavioral incidents is different for New treatment and Routine treatment i.e. New Treatment has some different effect on the number of serious behavioral incidents when compared to Routine treatment.

Conceptual Information

Null hypothesis: Population Parameter of no effect

Directional research hypothesis:

  • Directional alternative hypothesis states that the null hypothesis is wrong, and also specifies whether the true value of the parameter is greater than or less than the reference value specified in null hypothesis.
  • Non-directional research hypothesis: In this direction of the statement is not specified.
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