Hypothesis Testing

Question 1

Confidence Intervals

Answer 1

An interval in which we are very confident the population proportion lies. Is frequently 95%.

Question 2

Null Hypothesis

Answer 2

Is the hypothesis to be tested. Assumed true until the data indicates otherwise. Typically the null hypothesis assumes no effect.

Question 3

Alternative Hypothesis

Answer 3

Contains all values that would lead us to reject the null hypothesis. If it is rejected we have established support for the alternative hypothesis.

Question 4

P-value

Answer 4

Probability of obtaining a value of the test statistic as large as the one computed from the sample data if the null hypothesis is true. The smaller the P-value, the less likely Ho is to be true and therefore the more evidence there is against it. reject Ho if P<0.05 (5%).

Question 5

Statistically Significant

Answer 5

If the decision is to reject the null hypothesis then the results are said to be statistically significant.

Question 6

Paired data

Answer 6

paired t-test

Question 7

Two independent groups

Answer 7

t-test

Question 8

Means: More than two independent groups

Answer 8

ANOVA

Question 9

Proportions: Two or more independent groups

Answer 9

chi-square test