stat

Name:

Quiz 2

Stat 244 Spring 2015 Week 3

1. In a large population, it is known that a certain cold virus will cause the average body temperature to be 99.5 degrees. In a sample of 25 cold sufferers taking a new drug, the average temperature is 98.5 degrees, with a sample standard deviation of 1.0 degrees. Is there evidence that the drug is useful in lowering body temperature? Use = 0.01.

H0:

H1:

2. In a recent poll, 55 out of 80 people surveyed approved of a certain land-use decision. Does this provide sufficient evidence to conclude that more than half of the population supports the decision? Use = 0.05.

Interpretation:

Decision (Reject or Fail to reject H0):

H0:

H1:

Decision:

Interpretation:

Test statistic:

Test statistic:

p-value:

p-value: