Question 1

A paired t test can be used where data for a quantifiable variable can be divided into two distinct groupings using a descriptive variable.

Accepted Answer

A paired t-test is used when comparing two related samples or matched pairs, not distinct groups.

Question 2

ANOVA can be used when data for a quantifiable variable can be divided into three or more mutually exclusive groupings using a descriptive variable.

Accepted Answer

ANOVA (Analysis of Variance) is a statistical method used to compare means among three or more groups to determine if at least one group mean is different from the others, making it suitable for data divided into multiple groups.

Question 3

Jemma is unsure whether to use a t test to see whether two groups are significantly related. Her ratio data, consisting of 120 cases, are skewed and the two groups are have different variances. She should ________.

Accepted Answer

The answer of Jemma is unsure whether to use a...

Question 4

Ben wishes to calculate the average gender of employees in his organisation. Which statistic should he use?

Accepted Answer

The answer of Ben wishes to calculate the average gender...

Question 5

Doris has read a research paper in a refereed journal which states "within this organisation age is strongly correlated with gender (r = 0.7, p <0.01)". She should ________.

Accepted Answer

Correlation is a measure of the strength of the relationship between two variables. In this case, the two variables are age and gender. The correlation coefficient, r, is a number between -1 and 1. A positive correlation coefficient indicates that as one variable increases, the other variable also increases. A negative correlation coefficient indicates that as one variable increases, the other variable decreases. The p-value is a measure of the statistical significance of the correlation. A p-value of less than 0.05 indicates that the correlation is statistically significant.In this case, the correlation coefficient is 0.7, which indicates a strong positive correlation between age and gender. The p-value is less than 0.01, which indicates that the correlation is statistically significant. Therefore, we can conclude that there is a strong positive correlation between age and gender in this organization.

Question 6

What do you need to undertake to predict the value of a variable from two or more other variables?

Accepted Answer

Regression analysis is used to predict the value of a dependent variable based on the values of two or more independent variables.

Question 7

In the equation "y = a + bx", what are "y" and "a"?

Accepted Answer

y is the dependent variable because its value depends on the value of x. a is the constant because it does not change as x changes.

Question 8

Dave wants to test whether those who responded to an employee questionnaire are representative of the total population of employees. He has data about occupation for both his respondents and the total population of employees which he can rank in order of seniority. Which statistical test would be most suitable?

Accepted Answer

The Kolmogorov-Smirnov test is a non-parametric test that can be used to compare the distributions of two samples. It is a suitable test for Dave's situation because he wants to test whether the distribution of occupations in his respondents is different from the distribution of occupations in the total population of employees.

Question 9

Which correlation coefficient is most appropriate if you have tied ranks in your data?

Accepted Answer

The answer of Which correlation coefficient is most appropriate if...

Quiz 12: Analysing Quantitative Data