Question 1

A post-hoc test is:&#10;A) a test to compare two or more means in an overall test.&#10;B) a test to determine regression to the mean.&#10;C) a follow-up test to ANOVA when there are three or more groups.&#10;D) a follow-up test to the independent t-test.

Accepted Answer

A post-hoc test is a follow-up test to ANOVA when there are three or more groups. It is used to determine which specific groups differ significantly from one another after the overall ANOVA test has found a significant result. Therefore, option C is the correct choice. The other options are incorrect as they do not accurately describe the purpose or usage of a post-hoc test.

Question 2

_is the set of procedures used to explain or predict the values of a dependent variable based on values of one or more independent variables.&#10;A) Regression analysis&#10;B) Regression coefficient&#10;C) Regression equation&#10;D) Regression line

Accepted Answer

Regression analysis is a statistical method for examining the relationship between a dependent variable and one or more independent variables.

Question 3

What is the median for the following set of scores: 18, 6, 12, 10, 14?&#10;A) 10&#10;B) 14&#10;C) 18&#10;D) 12

Accepted Answer

To find the median, we need to arrange the scores in ascending or descending order. The order would be: 6, 10, 12, 14, 18. The median is the middle number, so in this case it would be 12. Therefore, the answer is D.

Question 4

The purpose of ____is to summarize and explain a specific set of data.&#10;A) descriptive statistics&#10;B) inferential statistics&#10;C) parametric procedures&#10;D) nonparametric procedures

Accepted Answer

Descriptive statistics is the branch of statistics that deals with the summary, organization and interpretation of a set of data. It includes measures of central tendency (mean, median, mode), measures of variability (range, variance, standard deviation), and graphical representations (histograms, box plots, scatter plots) that help to describe and understand the data. The purpose of descriptive statistics is to provide a clear and concise summary of the data, which can be used for further analysis and decision making.

Question 5

A statistical test used to compare two or more groups is called:&#10;A) simple regression.&#10;B) post-hoc test.&#10;C) t-test for regression.&#10;D) one-way ANOVA.

Accepted Answer

One-way ANOVA is the statistical test used to compare two or more groups. It is used to test whether there are significant differences between the means of the groups. Simple regression is a statistical test used to establish a relationship between two continuous variables, post-hoc test is used to make multiple comparisons after an ANOVA, and t-test for regression is used to determine the significance of a slope in a linear regression model. Therefore, D is the best choice for this question.

Question 6

How many dependent variables are used in simple linear regression?&#10;A) one&#10;B) two&#10;C) two or more&#10;D) three

Accepted Answer

Simple linear regression involves only one dependent variable (Y) and one independent variable (X). Therefore, the answer is A.

Question 7

The _is the value you calculate when you want the arithmetic average.&#10;A) mean&#10;B) median&#10;C) mode&#10;D) all of the above

Accepted Answer

The mean is the value you calculate when you want to find the arithmetic average. The median is the middle value when a set is ordered from least to greatest, and the mode is the most frequently occurring value in a set. While all three measures are important in statistics, the question specifically asks for the value used to find the arithmetic average, which is the mean.

Question 8

If a distribution is skewed to the left, then it is ______.&#10;A) negatively skewed&#10;B) positively skewed&#10;C) symmetrically skewed&#10;D) symmetrical

Accepted Answer

Skewed left means that the tail of the distribution is longer on the left side than on the right. This indicates that there are more extreme values on the left side, and so the mean is likely to be smaller than the median. This is known as negative skewness.

Question 9

Which of the following represents the fiftieth percentile, or midpoint of a distribution?&#10;A) mean&#10;B) median&#10;C) mode&#10;D) variance

Accepted Answer

The median is the value that separates the distribution into two equal parts, with 50% of the data below it and 50% above it. Therefore, it represents the fiftieth percentile. The mean represents the average value of the distribution, the mode represents the most frequent value, and the variance represents the spread or variability of the data.

Question 10

The standard deviation is:&#10;A) the square root of the variance.&#10;B) a measure of variability.&#10;C) an approximate indicator how numbers vary from the mean.&#10;D) all of the above

Accepted Answer

The standard deviation is defined as the square root of the variance, which is a measure of variability. It is also an approximate indicator of how numbers vary from the mean. Therefore, all of the above options are correct.

Deck 10: Analyzing Data