WGU C741 Pre Assessment
A university is interested in studying if socioeconomic status (SES) affects a student’s final grade
(out of 100 points) using students in an introductory psychology class as the sample. The study
measured SES with the Kuppuswamy scale, which classifies study populations into high, middle,
and low SES.
Kuppuswamy Scale (SES)
Low n = 7
Middle n = 16
High n = 9
Total n = 32
Which statistical technique should the university use to analyze the data?
Kruskal-Wallis test
Mann-Whitney U test
One-way ANOVA
t-test – ✔✔Kruskal-Wallis test
Which statement regarding the Kruskal-Wallis test is correct?
The Kruskal-Wallis test can be used on data that is not normally distributed.
The Kruskal-Wallis test is as powerful as the ANOVA.
It is possible to use the Kruskal-Wallis test on data measured on a nominal scale.
The variances from each data group must be homogeneous to conduct a Kruskal-Wallis test. –
✔✔The Kruskal-Wallis test can be used on data that is not normally distributed.
Which statement regarding correlation analysis is correct?
Correlation analysis does not allow a researcher to establish a causal relationship.
If there is no correlation found between two variables, it means that there is no relationship
between the two variables.
Outliers do not affect the strength of a correlation.
Correlations allow a researcher to make inferences about the results obtained. – ✔✔Correlation
analysis does not allow a researcher to establish a causal relationship.
A consultancy collects the amount of time it takes consultants to handle project tasks.
Which two techniques are appropriate to compare the mean times of two subsets within this set
of consultants?
Choose 2 answers
t-test
Principal component analysis
ANOVA
Logistic regression – ✔✔t-test
ANOVA
A data analyst needs to determine whether there is a relationship between how much money a
family spends on vacation and their annual income. The analyst randomly selects 20 families to
study for the analysis.
Why is linear regression the appropriate method to use?
Parameter estimate is not meaningful.
Two variables are being analyzed.
Error terms follow a skewed distribution.
Population variance is different for both groups. – ✔✔Two variables are being analyzed.