AP Biology Chi-Square

Find the degrees of freedom.

• 4

• 5

• 6

• 7

The appropriate null hypothesis for performing a chi-square test is that

• equal proportions of female and male teenagers are almost certain they will be married in 10 years.

• there is no difference between the distributions of female and male teenagers' opinions about marriage in this sample.

• there is no difference between the distributions of female and male teenagers' opinions about marriage in the population.

• there is no association between gender and opinion about marriage in the sample.

• there is no association between gender and opinion about marriage in the population.

Mrs. Hock asks her class what their favorite ice cream flavor is. She wonders if the flavors are equally represented. The table shows the observed values. How many degrees of freedom are there?

• 4

• 3

• 2

• 1

Mrs. Hock asks her class what their favorite ice cream flavor is. She wonders if the flavors are equally represented. The table shows the observed values. What is the Chi Square statistic?

• 4.4

• 0.221

• 3

• 3.2

A chi-square test is used to test whether a 0 to 9 spinner is "fair" (that is, the outcomes are all equally likely).  The spinner is spun 100 times, and the results are recorded.  The expected counts for spinning a 5 will be

• 5

• 10

• 11.1

• 20

If the findings of the research showed that the difference between the experimental and control group was relatively large, it would be said that it is

• randomized

• had confounding variables

• statistically significant

• had a standard deviation

In an AP Biology experiment, students are testing the inheritance pattern of a particular trait in pea plants. They expect a 3:1 ratio of dominant to recessive phenotypes. After conducting the experiment, they observe 75 dominant and 25 recessive phenotypes. What is the expected number of recessive phenotypes if the ratio is correct?

• A) 20

• B) 25

• C) 30

• D) 35

Tags

NGSS.HS-LS3-3

A student performs a chi-square test to determine if a die is fair. The die is rolled 60 times, and the results are recorded. What is the expected frequency for each face of the die?

• A) 6

• B) 10

• C) 12

• D) 15

In a genetics experiment, a chi-square test is used to compare observed and expected frequencies of a trait. If the calculated chi-square value is greater than the critical value, what should the student conclude?

• A) Accept the null hypothesis

• B) Reject the null hypothesis

• C) Accept the alternative hypothesis

• D) Reject the alternative hypothesis

Tags

NGSS.HS-LS3-3

Which of the following statements is true about the chi-square test?

• A) It is used to compare means of two groups

• B) It is used to test the independence of two categorical variables

• C) It is used to test the correlation between two variables

• D) It is used to test the equality of variances