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Exam 2: Frequency Distributions.

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Question 41

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It is customary to list the score categories in a frequency distribution from the highest down to the lowest.

A) True
B) False

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Question 42

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A set of scores ranges from X = 18 to X = 91.If the scores were put in a grouped frequency distribution table with an interval width of 10 points,the top interval would be 91-100.

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B) False

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Question 43

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Which types of graphs are used for data from an interval scale?

What term is used to describe the shape of a distribution in which the scores pile up on the left-hand side of the graph and taper off to the right?

A set of scores ranges from a high of X = 24 to a low of X = 5.If these scores were put in a frequency distribution table with an interval width of 2 points,which of the following would be the top interval in the table?

What kind of frequency distribution graph shows the frequencies as bars,with no space between adjacent bars?

A set of scores ranges from a high of X = 96 to a low of X = 11.If these scores were placed in a grouped frequency distribution table,what is the best value for the interval width?

For the distribution shown in the following table,N = 5. $\begin{array} { c l } X & \mathrm { f } \\\hline 5 & 2 \\4 & 8 \\3 & 5 \\2 & 3 \\1 & 2\end{array}$

A professor records the number of students who are absent each day for the semester.Because this is a discrete variable,a bar graph should be used to show the frequency distribution.

A histogram is constructed so that adjacent bars touch.

A researcher collects a sample of n = 20 Introductory Psychology textbooks and records the number of pages in each book.The results are then placed in a grouped frequency distribution table using intervals of 0-99 pages,100-199 pages,200-299 pages,and so on.If the results were converted into a frequency distribution graph,what kind of graph should be used?

A skewed distribution typically has _____ tail(s) and a normal distribution has ____ tail(s) .

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?

For the following frequency distribution of exam scores,how many students had scores lower than X = 80? $\begin{array} { l l } X & \mathrm { f } \\\hline 90 - 94 & 3 \\85 - 89 & 4 \\80 - 84 & 5 \\75 - 79 & 2 \\70 - 74 & 1\end{array}$

The classrooms in the Psychology department are numbered from 100 to 108.A professor records the number of classes held in each room during the fall semester.If the results were presented in a frequency distribution graph,the professor should use a bar graph.

For the following distribution,what percentage of the individuals have scores of X = 1? $\begin{array} { l l } X & \mathrm { f } \\\hline 5 & 2 \\4 & 8 \\3 & 5 \\2 & 3 \\1 & 2\end{array}$

For the following distribution of quiz scores,if a score of X = 3 or higher is needed for a passing grade,how many individuals failed the quiz? $\begin{array} { l l } X & f \\\hline 5 & 6 \\4 & 5 \\3 & 5 \\2 & 3 \\1 & 2\end{array}$

A group of quiz scores ranges from 3 to 10,but no student had a score of X = 5.If the scores are put in a frequency distribution table,X = 5 would not be listed in the X column.

For the data in the following table,what is the value of ?X? $\begin{array} { l l } X & f \\\hline 4 & 1 \\3 & 2 \\2 & 4 \\1 & 2 \\\hline\end{array}$

If a set of exam scores forms a negatively skewed distribution,what can you likely conclude about the students' scores?