1) In a two-tailed hypothesis test, the test statistic is determined to be z = -2.5. The p-value for this test: Why?
a) is 0.0062.
b) is 0.0124.
c) is 0.4938.
d) cannot be determined, since the level of confidence is not given.
2. The table gives beverage preferences for random samples of teens and adults.
Teens Adults Total
| Coffee |
50 |
200 |
250 |
| Tea |
100 |
150 |
250 |
| Soft Drink |
200 |
200 |
400 |
| Other |
50 |
50 |
100 |
| Total |
400 |
600 |
1000 |
We are asked to test for independence between age (ie adult and teen) and drink preference.
The expected number of adults who prefer coffee is:
a) 0.25
b) 0.33
c) 150
d) 200