Chapter 12: Problem 45
Describe how to construct a frequency polygon from a histogram.
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Chapter 12: Problem 45
Describe how to construct a frequency polygon from a histogram.
These are the key concepts you need to understand to accurately answer the question.
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The city council of a large city needs to know whether its residents will support the building of three new schools. The council decides to conduct a survey of a sample of the city's residents. Which procedure would be most appropriate for obtaining a sample of the city's residents? a. Survey a random sample of teachers who live in the city. b. Survey 100 individuals who are randomly selected from a list of all people living in the state in which the city in question is located. c. Survey a random sample of persons within each neighborhood of the city. d. Survey every tenth person who enters City Hall on a randomly selected day.
In Exercises 9–12, find the mean for the data items in the given frequency distribution. $$ \begin{array}{|c|c|} \hline \begin{array}{c} \text { Score } \\ \boldsymbol{x} \end{array} & \begin{array}{c} \text { Frequency } \\ \boldsymbol{f} \end{array} \\ \hline 1 & 1 \\ \hline 2 & 3 \\ \hline 3 & 4 \\ \hline 4 & 4 \\ \hline 5 & 6 \\ \hline 6 & 5 \\ \hline 7 & 3 \\ \hline 8 & 2 \\ \hline \end{array} $$
Give an example of a phenomenon that is normally distributed. Explain why. (Try to be creative and not use one of the distributions discussed in this section.) Estimate what the mean and the standard deviation might be and describe how you determined these estimates.
A set of data items is normally distributed with a mean of 60 and a standard deviation of 8 . In Exercises 33-48, convert each data item to a z-score. 92
A questionnaire was given to students in an introductory statistics class during the first week of the course. One question asked, "How stressed have you been in the last \(2 \frac{1}{2}\) weeks, on a scale of 0 to 10 , with 0 being not at all stressed and 10 being as stressed as possible?" The students' responses are shown in the frequency distribution. Use this frequency distribution to solve Exercises 3-6. $$ \begin{aligned} &\begin{array}{|c|c|} \hline \text { Stress Rating } & \text { Frequency } \\ \hline 0 & 2 \\ \hline 1 & 1 \\ \hline 2 & 3 \\ \hline 3 & 12 \\ \hline 4 & 16 \\ \hline 5 & 18 \\ \hline \end{array}\\\ &\begin{array}{|c|c|} \hline \text { Stress Rating } & \text { Frequency } \\ \hline 6 & 13 \\ \hline 7 & 31 \\ \hline 8 & 26 \\ \hline 9 & 15 \\ \hline 10 & 14 \\ \hline \text { Source Joumal of Personality and } \\ \hline \end{array}\\\ &\text { Social Psychology, 69, 1102-1112 } \end{aligned} $$ Which stress rating describes the greatest number of students? How many students responded with this rating?
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