AP Biology Unit 5 Chi Square

What is the

χ² _calculated value for the following situation.

• 6.65

• 6.66

• 0.00991

• 1

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. What is the Chi Square statistic?

• 4.4

• 0.221

• 3

• 3.2

Tags

NGSS.HS-LS3-3

Which of the following is the primary purpose of using a Chi-Square test in AP Biology Unit 5?

• To determine the mean of a data set

• To compare observed and expected frequencies

• To calculate the standard deviation

• To find the correlation between two variables

In a Chi-Square test, what does a high Chi-Square value indicate?

• The observed data fits the expected data well

• There is a significant difference between observed and expected data

• The data is normally distributed

• The sample size is too small

Which of the following is a necessary condition for using the Chi-Square test?

• Data must be continuous

• Data must be categorical

• Data must be normally distributed

• Data must be ordinal

In an experiment, the expected ratio of phenotypes is 3:1. If the observed ratio is significantly different, what statistical test would you use to analyze this?

• T-test

• ANOVA

• Chi-Square test

• Regression analysis

Tags

NGSS.HS-LS4-3

What is the null hypothesis in a Chi-Square test?

• There is no difference between observed and expected frequencies

• There is a difference between observed and expected frequencies

• The data is normally distributed

• The sample size is adequate

How do you calculate the degrees of freedom for a Chi-Square test?

• Number of categories minus one

• Number of categories plus one

• Number of observations minus one

• Number of observations plus one

Tags

NGSS.HS-LS4-3

Which of the following is an example of categorical data suitable for a Chi-Square test?

• Height of students

• Temperature readings

• Blood type

• Time taken to run a mile