Statistical tests

Question 1

what does the critical value in Chi-square determine?

Answer 1

value that corresponds to a 0.05 (5%) level of probability that the difference between observed and expected results is due to chance

Question 2

what if chi squared value is larger than or equal to the critical value?

Answer 2

• significant difference between the observed and expected results
• difference NOT DUE to chance (due to something else)
• REJECT null hypothesis

Question 3

what if chi squared value is smaller than the critical value?

Answer 3

• no significant difference between observed and expected results
• difference DUE to chance
• ACCEPT null hypothesis

Question 4

what is degrees of freedom in CHI-SQUARED TEST?

Answer 4

the number of groups in the experiment (eg. the number of different phenotypes) MINUS ONE

Question 5

what does the Student’s T test determine?

Answer 5

whether the means for two sets of data are significantly different (eg. whether a drug is actually effective using the