Chapter 2 Intro To Stats

Bar graph

A professor recorded the academic major for each student in an introductory psychology class. If the data are presented in a frequency distribution graph, what type of graph should be used?

90-99

A set of scores ranges from a high of X = 96 to a low of X = 27. If these scores are placed in a grouped frequency distribution table with an interval width of 10 points, the top interval in the table would be ________.

cf/N times (100)

C%

16

For the following distribution of quiz scores, if a score of X = 3 or higher is needed for a passing grade, how many individuals passed? X f 5 6 4 5 3 5 2 3 1 2

5

For the following distribution, what is the width of each class interval? X f 20-24 2 15-19 5 10-14 4 5-9 1

N: 10

For the following frequency distribution, how many individual scores are in the entire set? X f 5 2 4 4 3 1 2 3

35

For the following frequency distribution, what is the value of X? X f 5 2 4 4 3 1 2 3

Histogram

Height of bar is frequency. • Width of bar is interval size. • Sides of bar come down at real limits of the interval. • Midpoints of intervals typically labeled.

Y axis/ X axis

In a frequency distribution graph, frequencies are presented on the ________ and the scores (categories) are listed on the ________.

Frequency polygram

Points placed directly over midpoints Height of point is the frequency. Midpoints of intervals labeled.

Negatively Skewed

The students in a psychology class seemed to think that the midterm exam was very easy. If they are correct, what is the most likely shape for the distribution of exam scores?

Symmetrical

What is the shape of the distribution for the following set of data? Scores: 1, 1, 1, 2, 3, 3, 3