ASSESSMENT 3
Closing date: Tuesday, 9 May 2023 @ 23:00
Total: 50 marks
Study material: Lessons 11 to 14
Use computational formulas where applicable and round off the final answer to two decimals.
(Values read from tables must be given unaltered).
QUESTION 1 [6]
Indicate whether the following statements are True or False.
1.1 The single-sample t-test is used when you have a single set of scores and are investigating whether
the mean of this sample equals a known mean.
1.2 A Type II error is made by rejecting the null hypothesis when it is in fact true.
1.3 ANOVA allows us to test for differences between more than two group means and to examine the
effects of more than one independent variable.
1.4 ANOVA is an acronym for analysis of variables.
1.5 A Type I error is made by not rejecting the null hypothesis when it is false.
1.6 A Chi-Square test is typically used to test for association between two categorical variables.
QUESTION 2 [10]
2.1 Explain the difference between a null hypothesis and an alternative hypothesis. Your explanation
must include an example. (NB: Use your own words to avoid plagiarising). (4)
2.2 State whether the following alternative hypothesis are nondirectional or directional. Justify your
answer. (6)
a) H1: μ1 > μ2
b) H1: μA < μB
c) H1: μA ≠ μB
[TURN OVER]
Closing date: Tuesday, 9 May 2023 @ 23:00
Total: 50 marks
Study material: Lessons 11 to 14
Use computational formulas where applicable and round off the final answer to two decimals.
(Values read from tables must be given unaltered).
QUESTION 1 [6]
Indicate whether the following statements are True or False.
1.1 The single-sample t-test is used when you have a single set of scores and are investigating whether
the mean of this sample equals a known mean.
1.2 A Type II error is made by rejecting the null hypothesis when it is in fact true.
1.3 ANOVA allows us to test for differences between more than two group means and to examine the
effects of more than one independent variable.
1.4 ANOVA is an acronym for analysis of variables.
1.5 A Type I error is made by not rejecting the null hypothesis when it is false.
1.6 A Chi-Square test is typically used to test for association between two categorical variables.
QUESTION 2 [10]
2.1 Explain the difference between a null hypothesis and an alternative hypothesis. Your explanation
must include an example. (NB: Use your own words to avoid plagiarising). (4)
2.2 State whether the following alternative hypothesis are nondirectional or directional. Justify your
answer. (6)
a) H1: μ1 > μ2
b) H1: μA < μB
c) H1: μA ≠ μB
[TURN OVER]
