Question 1: Using SPSS, compare the numbers of attacks on the two drug treatments using the sign test.
Click Nonparametric Tests, Legacy dialogs, 2 Related Samples. Choose variables 'Attacks while on placebo' and 'Attacks while on pronethalol'. Note that you must highlight each variable and click the arrow to transfer it to Test Pairs. Click Sign. Click OK.
You should get the following output:
Frequencies | ||
---|---|---|
N | ||
Attacks while on pronethalol - Attacks while on placebo | Negative Differences ^{a} | 11 |
Positive Differences^{b} | 1 | |
Ties^{c} | 0 | |
Total | 12 | |
a. Attacks while on pronethalol < Attacks while on placebo | ||
b. Attacks while on pronethalol > Attacks while on placebo | ||
c. Attacks while on pronethalol = Attacks while on placebo |
Test Statistics^{b} | |
---|---|
Attacks while on pronethalol - Attacks while on placebo | |
Exact Sig. (2-tailed) | .006^{a} |
a. Binomial distribution used. | |
b. Sign Test |
The P value is 0.006, as in the lecture.
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Last updated: 31 January, 2012.