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Question category: Statistics

You carry out a study looking at the impact of increasing awareness of the indications of an investigation that is often needlessly over ordered. A random sample of patient notes before the teaching is selected as well as a random sample afterwards. The notes are checked to look for evidence of needless investigation. The analysis uses a Chi squared test and the result is 2.668, p =0.04. What does p =0.04 signify?

If there was no difference in unnecessary investigation rate then the chance of this result occurring is 4%

There was a fall of 4% in unnecessary investigations

The probability that the result is due to chance is 4%

There is a 0.04 chance that the null hypothesis is true

The mean unnecessary investigation rate was 4%

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