0 out of 0.25 pointsThe real limits of a discrete variable are those values that are above and below the recorded value by one half of the smallest measuring unit of the scale.

Question 1

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The real limits of a discrete variable are those values that are above and below the recorded value by one half of the smallest measuring unit of the scale.

 

Question 2

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A researcher has collected some data on the amount of time in seconds (to the nearest 0.1 second) that it took trained rats to run through a maze. The data is shown in the frequency distribution of grouped scores that follows.

The percentile rank of a score of 6.5 is _________.

Question 3

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Number of bar presses is an example of a(n) _______ variable.

Question 4

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Measurement is always approximate with a continuous variable.

 

Question 5

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Which of the following numbers is rounded incorrectly to two decimal places?

Question 6

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In order to estimate the amount of TV watched by New York City adults, a sociologist surveys a random sample of adults from this city. The obtained raw scores are called _________.

Question 7

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Given the data X1 = 1, X2 = 4, X3 = 5, X4 = 8, X5 = 10, evaluate .

 

Question 8

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Given the following set of numbers, X1 = 2, X2 = 4, X3 = 6, X4 = 10, what is the value of N?

Question 9

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Classifying students into whether they are good, fair, or poor speakers is an example of ordinal scaling.

Question 10

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In order to estimate the height of all students at your university, let’s assume you have measured the height of all psychology majors at the university. The height scores of all psychology majors constitute a _________.

 

Question 11

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A psychologist is interested in the social interactions of preschool children. She measures the number of verbal interactions that each child at a preschool engages in during a day. Here is the frequency distribution of the data.

The real limits of the interval 56-65 are _________.

Question 12

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The number of students in a class is an example of a continuous variable.

Question 13

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A discrete variable requires nominal or interval scaling.

Question 14

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If the range of a distribution were 89 and the data were reported as whole numbers, what would the width of the class interval be if one chose to group the distribution into approximately 14 class intervals?

Question 15

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X = Y/Z can be expressed as _______.

Question 16

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Given the distribution of grouped scores shown in the following table. The percentile rank of a score of 41 equals _________.

Question 17

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In order to estimate the height of all students at your university, let’s assume you have measured the height of all psychology majors at the university. If you had measured the height scores of all students at your university, the average (mean) of these scores would constitute a _________.

 

Question 18

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What is 17.295 rounded to one decimal place?

Question 19

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A relative frequency distribution indicates the number of scores that fall below the upper real limit of each interval.

 

Question 20

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Rounding 55.55 to the nearest whole number gives 55.

 

Question 21

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At the annual sailing regatta, prizes are awarded for 1st, 2nd, 3rd, 4th, and 5th place. These “places” comprise a(n) _________.

Question 22

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The symbol “S” means:

Question 23

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All frequency distributions should be of grouped scores.

Question 24

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A statistic is to a sample as a parameter is to a population.

Question 25

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Given the following set of numbers, X1 = 2, X2 = 4, X3 = 6, X4 = 10, what is the value of (EX)/N?

Question 26

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Stem and leaf diagrams are like histograms, except that they lose the original scores.

 

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