Unit 14: Inferential Statistics and Hypothesis Testing

Question 1

Inferential Statistics

Answer 1

Procedures for drawing conclusions based on sample data

Question 2

Hypothesis Testing

Answer 2

Used to determine whether hypothesis is supported or rejected by the results

Question 3

The Null Hypothesis

Answer 3

Establishes there is no significant difference between two groups
Ho : Ua = Ub
Reject the null

Question 4

The Alternative Hypothesis

Answer 4

Predicts a significant difference between groups
Hc : Ua does not equal Ub
Fail to reject the null

Question 5

Two Tailed Hypothesis

Answer 5

Predicts groups differ but does not specify a direction

Question 6

One Tailed Hypothesis

Answer 6

Predicting direction of expected results

Question 7

Type 1 Error

Answer 7

Predicting a significant difference in the results where there is no difference between the results (more serious)

Question 8

Type 2 Error

Answer 8

Predict no difference between groups when there is a significant difference

Question 9

Statistical Difference

Answer 9

Probability the results are not due to chance

Question 10

P-Value or Alpha Level

Answer 10

Acceptable level of error

0.05

Question 11

Confidence Interval

Answer 11

An interval of certain width which we know will contain the population mean when we know the sample mean
(95%)

Question 12

Statistical Power

Answer 12

The ability to find statistically significant differences when they do exist