Chi Square Biology

What is the primary purpose of the Chi Square test in AP® Biology?

• To calculate the average of a data set

• To determine if observed data significantly differs from expected data

• To predict future biological outcomes

• To memorize biological terms

Which significance level (column) do you look at when finding the critical value on a chi square chart in AP Bio?

• .50

• .10

• .05

• .001

What does the symbol '∑' represent in the Chi Square equation?

• Difference

• Sum

• Division

• Product

What does a Chi Square value greater than the critical value indicate?

• The null hypothesis is accepted

• The null hypothesis is rejected

• The experiment is invalid

• The data is inconclusive

What is the significance of a .05 critical value in the Chi Square test?

• There is a 50% chance the results are due to chance

• There is no chance the results are due to chance

• There is a 95% chance the results are due to chance

• There is a 5% chance the results are due to chance

What is the χ² _calculated value for the following situation.

• 6.65

• 6.66

• 0.00991

• 1

Observed in the wild are 10 circles, 20 squares and 30 triangles. The ratio for this particular population is 2:3:5 
observed: 10 circles     expected: 12
observed 20 squares    expected : 18
observed 30 triangles   expected: 30
What is the X² of this problem?

• .22

• .33

• .44

• .55

Tags

NGSS.HS-LS2-2

NGSS.HS-LS3-3

Gregor Mendel was experimenting with peas and exploring the basics of genetics. He knew that green (G) is dominant over yellow (g) peas. In one experiment, he crossed a heterozygous green pea with a homozygous yellow pea. In the F1 generation he obtained a total of 400 peas out of which 180 were green and 220 were yellow.

a. Calculate the chi-square to the nearest tenth.

c. Explain if the null hypothesis can be kept or rejected.

• x² = 4; Null hypothesis can be rejected because chi-square is greater than the critical value of 3.84.

• x² = 4.5; Null hypothesis can be kept because chi-square is less than the critical value of 5.99

• x² = 2; Null hypothesis can be rejected because chi-square is less than the critical value of 5.99

• x² = 4; Null hypothesis can be kept because chi-square is greater than the critical value of 3.84

What is the primary purpose of the Chi Square test in Biology?

• To calculate the average of a data set

• To determine if observed data significantly differs from expected data

• To predict future biological outcomes

• To memorize biological terms

What does the symbol '∑' represent in the Chi Square equation?

• Difference

• Sum

• Division

• Product