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Descriptive Statistics in Educational Research MCQ

A raw score that has been transformed into _____ units is called z score .

Answer

Correct Answer: Standard deviation

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The point where the regression line crosses the _____ is called y-intercept

Answer

Correct Answer: Y-axis

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A measure of the average deviation from the mean in squared units is called

Answer

Correct Answer: Variance

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Scores that have been converted from one scale to another to have a particular mean and standard deviation is called

Answer

Correct Answer: Standard scores

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The square root of the variance is known as

Answer

Correct Answer: Standard deviation

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Not symmetrical is called skew

Answer

Correct Answer: True

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Regression based on one dependent variable and one independent variable is called simple regression

Answer

Correct Answer: True

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A graph used to depict the relationship between two _____ is called scatter plot

Answer

Correct Answer: Quantitative variables

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The line that best fits a pattern of observations is called

Answer

Correct Answer: Regression line

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The equation that defines the regression line is called

Answer

Correct Answer: Regression equation

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The predicted change in Y given a 1-unit change in X is called

Answer

Correct Answer: Regression coefficient

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A set of statistical procedures that are used to explain or predict the values of a dependent variable on the basis of the values of one or more _____ is called regression analysis

Answer

Correct Answer: Independent variables

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The norm group that is used to determine the percentile ranks is called reference group

Answer

Correct Answer: True

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The percentage of people in a group who have a specific characteristic is called

Answer

Correct Answer: Rate

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The difference between the highest and lowest numbers is called

Answer

Correct Answer: Range

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Skewed to the _____ is called positively skewed

Answer

Correct Answer: Right

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Scores that divide a distribution into _____ equal parts is percentile ranks

Answer

Correct Answer: 100

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The percentage of scores in a reference group that fall below a particular raw score is called percentile ranks

Answer

Correct Answer: True

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A regression coefficient obtained in multiple regression is partial regression coefficients

Answer

Correct Answer: True

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A number that is very atypical of the other numbers in a distribution is called

Answer

Correct Answer: Outlier

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A unimodal, symmetrical, bell-shaped distribution that is the theoretical model of many variables is normal distribution

Answer

Correct Answer: True

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Skewed to the left is negatively skewed

Answer

Correct Answer: True

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Which exclusive refers to response categories that do not overlap?

Answer

Correct Answer: Mutual

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In which regression based on one dependent variable and two or more independent variables?

Answer

Correct Answer: Multiple

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The most frequently occurring number is called

Answer

Correct Answer: Mode

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The 50th percentile is called

Answer

Correct Answer: Median

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Provide information about where a score falls in relation to the other scores in the distribution of data is measure of relative standing

Answer

Correct Answer: True

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A numerical index that provides information about how spread out the data values are or how much variation is present is measure of variability

Answer

Correct Answer: True

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The single numerical value considered most typical of the values of a quantitative variable is measure of central tendency

Answer

Correct Answer: True

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The arithmetic average is known as

Answer

Correct Answer: Mean

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A graph that relies on the drawing of one or more lines is called

Answer

Correct Answer: Line graph

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Statistics that go beyond the immediate data and infer the characteristics of populations based on samples is _____ statistics

Answer

Correct Answer: Inferential statistics

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A set of numbers with little variability is _____

Answer

Correct Answer: Homogenous

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A graphic that shows the frequencies and shape that characterize a quantitative variable is called

Answer

Correct Answer: Histogram

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A set of numbers with a great deal of variability is called

Answer

Correct Answer: Heterogeneous

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The data values are clustered or grouped into separate intervals, and the frequencies of each interval are given is grouped frequency distribution

Answer

Correct Answer: True

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An arrangement in which the frequencies of each unique data value are shown is frequency distribution

Answer

Correct Answer: True

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Exhaustive refers to the property that the set of intervals covers the complete range of data values is called

Answer

Correct Answer: Exhaustive

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Statistics that focus on describing, summarizing, and explaining a particular set of data is called

Answer

Correct Answer: Descriptive statistics

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A set of data is known as

Answer

Correct Answer: Data set

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In which table displaying information in cells formed by the intersection of two or more categorical variables?

Answer

Correct Answer: Contingency

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A graph that uses vertical bars to represent the data is called

Answer

Correct Answer: Bar graph

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A percentile rank reflects the percentage of scores in a reference group that fell below a certain raw score.

Answer

Correct Answer: True

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Raw scores that have been transformed into standard deviation units are called z scores.

Answer

Correct Answer: True

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A scatterplot is used to show the frequencies and shape that characterize a single quantitative variable.

Answer

Correct Answer: False

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The square root of the variance is the standard deviation.

Answer

Correct Answer: True

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Approximately 99% of scores fall within 2 standard deviations of the mean in a normal distribution.

Answer

Correct Answer: False

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Which of the following rules is correct when reading a contingency table?

Answer

Correct Answer: If the percentages are calculated down the columns, compare across the rows.

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If a test was very easy for the vast majority of students, except for a few students who had very low scores, then the distribution of scores would be ______.

Answer

Correct Answer: Negatively skewed

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In a fully normal distribution of scores, which of the following is true?

Answer

Correct Answer: The mean, median, and mode are the same number.

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What procedure is used to explain or predict the values of a dependent variable based on the values of two or more independent variables?

Answer

Correct Answer: Multiple regression analysis

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Which of the following is a measure of variability?

Answer

Correct Answer: Variance

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Which of the following is a measure of central tendency?

Answer

Correct Answer: Correlation coefficient

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How is a set of data organized?

Answer

Correct Answer: Each participant gets a row, and each variable gets a column.

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Hypothesis testing and estimation are both types of ______ statistics.

Answer

Correct Answer: Inferential

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We want to predict a person’s achievement test score using his or her years of education and aptitude test score. Here is the appropriate regression equation:Y = 25 + .5X1 +10X2,where Y = achievement test score, X1 = years of education, and X2 = aptitude test score.If the person has 10 years of education and an aptitude test score of 5, then what is his predicted achievement score? (Hint: just insert 10 for X1 and 5 for X2 in the equation.)

Answer

Correct Answer: 80

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What is the median of the following set of scores: 22, 6, 10, 11, 14?

Answer

Correct Answer: 11

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