Table 4: Preparing to calculate our test statistic
| Type of Movie | Snack | No Snacks |
| Action | Actual: 50 Expected: 64.58 |
Actual: 75 Expected: 60.42 |
|
Difference: 50 – 64.58 = -14.58 Squared Difference: 212.67 Divide by Expected: 212.67/64.58 = 3.29 |
Difference: 75 – 60.42 = 14.58 Squared Difference: 212.67 Divide by Expected: 212.67/60.42 = 3.52 |
|
| Comedy | Actual: 125 Expected 155 |
Actual 175 Expected 145 |
|
Difference: 125 – 155 = -30 Squared Difference: 900 Divide by Expected: 900/155 = 5.81 |
Difference: 175 – 145 = 30 Squared Difference: 900 Divide by Expected: 900/145 = 6.21 |
|
| Family | Actual: 90 Expected: 62 |
Actual: 30 Expected 58 |
|
Difference: 90 – 62 = 28 Squared Difference: 784 Divide by Expected: 784/62 = 12.65 |
Difference: 30 – 58 = -28 Squared Difference: 784 Divide by Expected: 784/58 = 13.52 |
|
| Horror | Actual: 45 Expected 28.42 |
Actual: 10 Expected 26.58 |
|
Difference: 45 – 28.42 = 16.58 Squared Difference: 275.01 Divide by Expected: 275.01/28.42 = 9.68 |
Difference: 10 – 26.58 = -16.58 Squared Difference: 275.01 Divide by Expected: 275.01/26.58 = 10.35 |
Lastly, to get our test statistic, we add the numbers in the final row for each cell: