BR3 Lesson 4 Quiz

Tick the correct answer(s). Significance level ______ :

• Measures chances of making Type 1 error

• Always set before test carried out

• Always set after test carried out

Type 1 error occurs when we __________:

• Accept a false null hypothesis

• Reject a true null hypothesis

• Reject a false null hypothesis

• Accept a true null hypothesis

Type 2 error occurs when we __________:

• Accept a false null hypothesis

• Reject a true null hypothesis

• Reject a false null hypothesis

• Accept a true null hypothesis

The following is the second step in process of hypothesis testing:

• Selection of appropriate statistical test

• Calculation of test statistic and acceptance or rejection of the hypothesis

• Specification of significance level

• Hypothesis formulation

Which is true for the null hypothesis?

• Best stated as things don't work

• Best stated as things are different than what they seem

• Best stated in terms of equalities, e.g. things are not different

• Best stated as what things are

The smaller the probability, the more likely it is that any difference found is a _______.

• null one

• only one

• fake one

• real one

The p-value does not tell you about how different your samples are, just that this difference is __________.

• significant

• statistically significant

• statistically not significant

• not significant

A test statistic, which is a measure of effect sizes, tells you how big the difference between the conditions is.

• True

• False

The statistical test we need to perform depends on _______ that we have collected.

The following are types of quantifiable data:

• Interval

• Nominal

• Ordinal

• Ratio