AP Biology Chi-Square

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 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 symbol is used to represent chi-square?

• X²

• n

• Ψ

• P

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-LS3-3

What is the

χ² _calculated value for the following situation.

• 6.65

• 6.66

• 0.00991

• 1

What are the expected counts of a female who likes Pepsi?

• 10.5

• 11

• 14.5

• 6.3

In the formula for Chi Squared, the E stands for

• the sum

• the observed frequency

• The expected frequency

• the p value

In the formula for Chi Squared, the O stands for

• the sum

• the observed frequency

• The expected frequency

• the p value