11.2 – Chi-Square: Goodness of Fit

HypothesesHo : The population fits the given distributionH1 : The population has a different distribution

Computing sample X2 for Goodness-of-Fit Test

with d.f. = k – 1 • where k is number of categories in the distribution

"Does the current distribution "fit" a past distribution?"

Ho: The percentage distribution for job incentives is the same as last year's.

H1: The percentage distribution is different.

To test this hypothesis, we will be taking a random sample of 500

employees and comparing the percentages with last years. α = .01

How to Test for Independence of Two Statistical Variables

Same as before…1. Null Hypothesis, alternative hypothesis, level

of significance2. X2

3. P-value 4. Reject or not reject null hypothesis5. Conclude using context.

Checkpoint

Prescott will lose tonight and Friday Night!

Homework

• Read Pages 484-490– Take notes on what we have not covered

• Do Problems – Page 490-493 (1-10) ODD

• Check odds in back of book

• Read and preload 11.3 information– Notes/vocab