Suppose there is an investigation into the relationship between taking aspirin and risk of heart attack....

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Suppose there is an investigation into the relationship between taking aspirin and risk of heart attack. Suppose 105 of the 1

math Statistics-And-Probability

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Answer 1

Answer #1

The observed counts given by the problem is tabulated as follows.



	Yes	No	Total
Aspirin	105	10929	11034
Placebo	188	10847	11035
Total	293	21776	22069

(a) The expected counts are given by,

	Yes	No	Total
Aspirin	146.49	10887.51	11034
Placebo	146.51	10888.49	11035
Total	293	21776	22069

(b) The chisquare statistic can be obtained by,

$\chi^2=\sum \frac{(observed\,frequency-expected\,frequency)^2}{expected\,frequency}=23.82068044$ =23.82

(c) The Chi square statistic of 23.82 is larger than the cut off of 6.63 required for a level 0.01, so the relationship is statistically significant. We can conclude that there is a relationship between taking aspirin and risk of a heart attack in the population.

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Suppose there is an investigation into the relationship between taking aspirin and risk of heart attack....

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