10.3 Chi-square Test for Independence

binomial data: In Step 1: Theorize for a chi-square test of independence, how many tail(s) situation is this?

(100%) One-tail to the right situation.

binomial data: Select all parts of the Step 2: Analyze for a chi-square test of independence?

(50%) Calculate each cell's expected frequency. (50%) Calculate the value of the chi-square test statistic.

binomial data: In Step A: Abstract for a chi-square test of independence, what are the final steps to complete the 2x2 table of descriptive statistics?

(50%) Calculate the Row Totals. (50%) Calculate the Column totals.

binomial data: Select all parts of the Step A: Abstract for a chi-square test of independence?

(50%) Collect the counts of the data values of the two variables. (50%) Arrange in a 2x2 table and calculate the table totals.

binomial data: In Step A: Abstract for a chi-square test of independence, what are the two hypotheses?

(50%) H(0): Variables are independent. (50%) H(1): Variables are dependent.

binomial data: In Step 1: Theorize for a chi-square test of independence, what are the shapes of the chi-square distributions?

(50%) The curve is uni-modal. (50%) The curve is skewed to the right.

binomial data: What is the difference between a descriptive 2x2 table of counts, and a contingency table?

A contingency table shows the expected frequencies in each cell.

binomial data: What is a chi-square test of independence?

A hypothesis test for two columns of binomial data.

binomial data: In a chi-square test of independence, what is the p-value?

The area in one tail of the chi-square curve from the test statistic to infinity.

binomial data: In Step 2: Analyze for a chi-square test of independence, what are the expected frequencies?

The theoretical count in each cell if the variables are independent

binomial data: In a chi-square test of independence, using the information shown below, are these two variables independent?

These variables are dependent, because p-value = 0.005.

binomial data: In a chi-square test of independence, using the information shown below, are these two variables independent?

These variables are independent, because p-value = 0.3155.

binomial data: In a chi-square test of independence, using the information shown below, is being overweight related to eating fast food?

Yes, being overweight and eating fast food are related, because p-value = 0.0323.