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Chapter 13

Practice Test

Practice Test

The following questions will help you assess your comprehension of chapter 13

This activity contains 31 questions.

	Match the phrase with is appropriate answer. A matching question presents 6 answer choices and 6 items. The answer choices are lettered A through F. The items are numbered 1.1 through 1.6. Screen readers will read the answer choices first. Then each item will be presented along with a select menu for choosing an answer choice. Using the pull-down menus, match each item in the left column to the corresponding item in the right column. range mode median mean distribution statistic 1.1 Numbers that describe some characteristic of a variable.   A B C D E F 1.2 Pattern of scores on some variable   A B C D E F 1.3 The average of a set of numbers   A B C D E F 1.4 The middle number in a set of ranked scores   A B C D E F 1.5 The most frequent score in a set of scores   A B C D E F 1.6 The differences between the highest and lowest values in a set of scores.   A B C D E F

	What is the most widely used statistical package for data analysis in educational research?   Ed.St. STED StatsEdu SPSS

	If you code "gender" as 1 or 0, values might be (1, male) or (0, female) This is an example of what?   Label Values Type Measure

	Which type of scale simply uses numbers as "names" for certain categories or individuals?   Nominal scale Interval scale Ordinal scale Ratio scale

	Which type of scale has numbers in a definite order, but there is nothing known about the distance between each number?   Ratio scale Interval scale Nominal scale Ordinal scale

	Which scale has scores differ from one another by the same amount, but there is no meaningful zero point?   Interval scale Ratio scale Nominal scale Ordinal scale

	Which scale has a true point of zero? An amount of money is an example, because it is meaningful for a person to have twice as much money.   Ratio scale Nominal scale Ordinal scale Interval scale

	After the mean, the most important piece of information about a set of scores is the _________________.   mode Distribution of numbers Degree of dispersion around the mean median

	What is the mean score of the roll of two dice?   7 6 5 8

	A family's average income is an example of what type of distribution?   Rational distribution Normal distribution Skewed distribution kurtosis

	In survey research, two standard errors of the mean is often called ___________.   Sampling error Standard error of deviation Standard error of the mean Statistical insignificances

	It is important that researchers in education understand statistics so that they can tell when others are not using statistics properly.    True  False

	Numbers in a nominal scale have no relationship to one another    True  False

	If there is an odd number of scores, the middle number is not the median.    True  False

	Scores tend to cluster around the most frequent score, the mode    True  False

	The range has limited usefulness because it is dependent on the values of only two scores.    True  False

	You use the same formula for the variance and standard deviation of a population, as you use for a sample.    True  False

	Many distributions in nature conform to the normal curve.    True  False

	A student who increased from the 10th to the 20th percentile gained less on a test than one who increased from the 40th to the 50th percentile    True  False

	It is possible for a non-normal distribution to not be skewed, but still deviate from the bell shape.    True  False

	The null hypothesis means two or more variables are not related.    True  False

	Inspection of graphs is a sufficient means of determining whether or not two groups differ.    True  False

	Decreasing alpha increases possibility of Type I error, but decreases the possibility of Type II error.    True  False

	One-tailed tests should rarely be used in social science research.    True  False

	Inferential statistics are used to compare groups to one another.    True  False

	A z-test is a statistic used to test the difference between two means for statistical significance.    True  False

	A teacher gave a biology test to 15 students. Find the mean, mode, and median of the students' scores. 94, 91, 88, 87, 83, 80, 79, 78, 75, 72, 70, 68, 65, 62, 58   To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

	A chemistry teacher gave a test on basic formulas. 18 students scored from 75% to 100%, but two did not know any of the formulas and both got zeros. Would it be better for the researcher to find the mean or the median of the two scores? Explain why.   To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

	A teacher gave a history test. Find the range of the following scores. 96, 90, 88, 86, 84, 79, 77, 76, 68, 66, 64, 62, 57, 55   To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

	Using the z-score formula: Z = x-m S Compute the Z score. A student with and IQ of 90 (M = 100, s = 10) received a 35 on a math test (M = 50, s = 5). Find the z-scores of each test to determine whether or not she was performing up to her ability level.   To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

	Imagine you did a random sample of 250 ninth graders in a school district with 2,400 ninth graders. Their mean mathematics score is 18.0 with a standard deviation of 5.0. What would the standard error of mean be?   To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

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