stats tests

Question 1

criteria for using Chi-squared test

Answer 1

• large sample size
• discrete data categories (yes/no, heads/tails, red/blue)
• using raw counts (not % or rates)
• comparison of experimental(observed)+theoretical(expected) results

Question 2

what is chi-squared used for in genetics

Answer 2

determine whether observed genetic ratios are sig diff from expected, and whether the diff is due to chance/smth else

Question 3

when do you accept H0 in chi-squared test

Answer 3

when x^2 value is LOWER than critical value at 5% sig level
suggests diff between observed+expected value due to chance

Question 4

t test used for (selection+evolution)

Answer 4

compare mean values of 2 datasets
determine whether diff between means is sig/due to chance

Question 5

criteria for t test

Answer 5

-data continuous+normally distributed
- variance of populations equal
- samples are independent of each other