IOP2601
ASSIGNMENT 2 SEMESTER 2 2025
UNIQUE NO.
DUE DATE: 25 AUGUST 2025
, QUESTION 1 [13]
1.1 _____ is a technique applied to samples in order to make inferences about
populations. Answer: Inferential statistics. (1)
1.2 Single-sample t-test … used to test if a sample mean equals a known mean.
Answer: True. (1)
1.3 Equal intervals ⇒difference between all points is uniform. Answer: True. (1)
1.4 Rejecting a true null hypothesis is a … Answer: Type I error (α-error). (1)
1.5 A quantity that does not change and always has the same value is a … Answer:
Constant. (1)
1.6 Properties of observations that can assume different values are called _____,
whereas a variable that can assume any value is known as _____. Answer: variables;
a continuous variable. (2)
1.7 Classify four variables as Independent or Dependent and justify. Answer: The four
variables weren’t provided in your prompt. You can classify by rule: the Independent
Variable (IV) is manipulated/presumed cause; the Dependent Variable (DV) is the
measured outcome/effect. Example template: “Study hours (IV) → Test score (DV);
Training type (IV) → Productivity (DV); Leadership style (IV) → Job satisfaction (DV);
Caffeine dose (IV) → Reaction time (DV).” (3)
1.8 Differences/similarities between mean, median, mode. (3)
Mean: arithmetic average; uses all scores; sensitive to outliers; best for
interval/ratio and symmetrical distributions.
Median: middle score; robust to outliers/skew; suitable for ordinal or skewed
interval/ratio data.
Mode: most frequent value; the only measure for nominal data; can be
multimodal; unstable in small samples.
ASSIGNMENT 2 SEMESTER 2 2025
UNIQUE NO.
DUE DATE: 25 AUGUST 2025
, QUESTION 1 [13]
1.1 _____ is a technique applied to samples in order to make inferences about
populations. Answer: Inferential statistics. (1)
1.2 Single-sample t-test … used to test if a sample mean equals a known mean.
Answer: True. (1)
1.3 Equal intervals ⇒difference between all points is uniform. Answer: True. (1)
1.4 Rejecting a true null hypothesis is a … Answer: Type I error (α-error). (1)
1.5 A quantity that does not change and always has the same value is a … Answer:
Constant. (1)
1.6 Properties of observations that can assume different values are called _____,
whereas a variable that can assume any value is known as _____. Answer: variables;
a continuous variable. (2)
1.7 Classify four variables as Independent or Dependent and justify. Answer: The four
variables weren’t provided in your prompt. You can classify by rule: the Independent
Variable (IV) is manipulated/presumed cause; the Dependent Variable (DV) is the
measured outcome/effect. Example template: “Study hours (IV) → Test score (DV);
Training type (IV) → Productivity (DV); Leadership style (IV) → Job satisfaction (DV);
Caffeine dose (IV) → Reaction time (DV).” (3)
1.8 Differences/similarities between mean, median, mode. (3)
Mean: arithmetic average; uses all scores; sensitive to outliers; best for
interval/ratio and symmetrical distributions.
Median: middle score; robust to outliers/skew; suitable for ordinal or skewed
interval/ratio data.
Mode: most frequent value; the only measure for nominal data; can be
multimodal; unstable in small samples.
