Suggested answer to exercise: Angina and pronethalol, 1

Question 1: Using SPSS, compare the numbers of attacks on the two drug treatments using the sign test.

Suggested answer

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

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

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.