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Questions and Answers List

Question	Answer
What is wrong with the following conclusion from the results of a statistical test? "A p-value of less than 0.05 or 5%, shows that the results are significant"	It must refer to the "differences in the results".
Results of an investigation into the effect of a drug on mean tumour mass should involve the use of which statistical test?	Student's t-test
Which statistical test is used on data that involves counts/frequencies?	Chi-squared
What does Standard Deviation measure?	Variation around the mean
Spearman Rank is a statistical test to determine strength of the link between two independent variables. What type of statistical test is this?	Correlation co-efficient.
What results/data does the Chi-squared compare?	Observed versus expected
What may a graph show Standard Deviation visually as	Error Bars
A probability of <0.001 means...	The probability of the differences in the data being the result of chance is less than 1%
What is the normal threshold of probability of statistical significance?	0.05/5%
What type of statement is this? "There is no difference between observed and expected data."	Null hypothesis