2 You are interested in researching whether or not AP biology students who use a test prep book perform better on the exam than those who do not use a test prep book You take 60 random students and give 30 of them a test prep book while the other 30 will use the resources they already have After the students take the exam you analyze the data and find that of the students who used a test prep book 26 passed For the students who used only the resources they already had you found that 12 passed With this data would you suggest to future students to use a test prep book Step 1 state the null hypothesis There is no result difference between students who used the resources test prep book and those who didn t Step 2 determine your expected values Step 3 complete the Chi square chart Step 4 calculate your degrees of freedom Step 5 interpret results Purple flowers 543 White flowers 213 Does this data fit the predicted phenotypic ratios Step 1 state the null hypothesis Step 2 determine your expected values hint what should the phenotypic ratio be Step 3 complete the Chi square chart 3 In pea plants purple flowers P are dominant to white flowers p A plant that is heterozygous is self crossed The following phenotypes were observed Step 4 calculate your degrees of freedom Observed O Step 5 interpret results Expected E O E O E O E E Observed O Expected E O E Total O E O E E Total