After applying a statistical test, an investigator gets a p-value of 0.01. What does this indicate about the null hypothesis?
AThere is a 1% probability of incorrectly rejecting the null hypothesis when it is true.
BThe test has a 99% chance of detecting a true effect if it exists.
CThe null hypothesis is likely to be rejected.
DThere is a 1% probability of observing the data, or something more extreme, if the null hypothesis is true.
A group of 80 people is being studied to determine the effect of diet modification on cholesterol levels. To compare the mean cholesterol levels before and after the diet modification in this group, which statistical test should be used?
APaired t-test
BMcNemar test
CChi-square test
DWilcoxon signed-rank test
EIndependent t-test
What is the most appropriate statistical test to test the statistical significance of the change in blood cholesterol levels after a month's treatment with atorvastatin?
APaired t-test
BUnpaired or independent t-test
CAnalysis of variance
DChi-square test
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