Lecture 7

Question 1

The null hypothesis as an assumption

Answer 1

H0, The null hypothesis the expresses the belief or assumption about the population parameter.
H1 (or Ha), The alternative hypothesis is that the belief or assumption is incorrect

Question 2

The alternative as a research question

Answer 2

• The alternative hypothesis is the conclusion that the researcher hopes to support.
• The null hypothesis is that the research hypothesis is incorrect

Question 3

Hypothesis tests

Answer 3

Is the data consistent with the null hypothesis?
3 test statistics with known distribution to decide the test

Question 4

Lower tailed tests

Answer 4

Lower tailed tests is when rejection region is in the left tail of the distribution

Question 5

Upper tailed test

Answer 5

Upper tailed tests is when the rejection region is in the right tail

Question 6

Two tailed test

Answer 6

Two tailed tests is wen the rejection region is in both tails

Question 7

hypothesis tests - sides

Answer 7

one sided tests and two sided tests

Question 8

Significance level

Answer 8

the side of the rejection region

Question 9

Significance level - lower

Answer 9

to the left in the standard normal distribution

Question 10

Significance level - upper

Answer 10

to the right in the standard normal distribution

Question 11

Significance level - two tailed

Answer 11

both sides för the standard normal distribution

Question 12

Significance level - what are the possible levels?

Answer 12

Two different possible errors
Type I error
Type II error

Question 13

Significance level - trade off

Answer 13

there is a trade off between committing a type I and type II error

Question 14

Critical values and p-values

Answer 14

Two equivalent ways of testing hypothesis.
There are never a conflict between these two methods! result in the same conclusion.