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Chapter 2: Problem 65
Which is the greatest, the mean, the mode, or the median of the data set? 11; 11; 12; 12; 12; 12; 13; 15; 17; 22; 22; 22
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\text鈥� # Twenty-five randomly selected students were asked the number of movies they watched the previous week. The results are as follows: $$\begin{array}{|l|l|}\hline \\# \text { of movies } & {\text { Frequency }} \\\ \hline 0 & {5} \\ \hline 1 & {9} \\ \hline 2 & {6} \\ \hline 3 & {4} \\\ \hline 4 & {1} \\ \hline\end{array}$$ a. Find the sample mean \(\overline{x}\) . b. Find the approximate sample standard deviation, s.
Use the following information to answer the next two exercises. X = the number of days per week that 100 clients use a particular exercise facility. $$\begin{array}{|l|l|}\hline x & {\text { Frequency }} \\ \hline 0 & {3} \\\ \hline 1 & {12} \\ \hline 2 & {33} \\ \hline 3 & {28} \\ \hline 4 & {11} \\\ \hline 5 & {9} \\ \hline 6 & {4} \\ \hline\end{array}$$ The \(80^{\text { th }}\) percentile is ____ a. 5 b. 80 c. 3 d. 4
One hundred teachers attended a seminar on mathematical problem solving. The attitudes of a representative sample of 12 of the teachers were measured before and after the seminar. A positive number for change in attitude indicates that a teacher's attitude toward math became more positive. The 12 change scores are as follows: 3; 8; 鈥�1; 2; 0; 5; 鈥�3; 1; 鈥�1; 6; 5; 鈥�2 a. What is the mean change score? b. What is the standard deviation for this population? c. What is the median change score? d. Find the change score that is 2.2 standard deviations below the mean.
For the next three exercises, use the data to construct a line graph. In a survey, 40 people were asked how many times they visited a store before making a major purchase. The results are shown in Table 2.37. $$\begin{array}{|l|l|}\hline \text { Number of times in store } & {\text { Frequency }} \\ \hline 1 & {4} \\ \hline\end{array}$$ $$\begin{array}{|l|l|}\hline \text { Number of times in store } & {\text { Frequency }} \\ \hline 2 & {10} \\ \hline 3 & {16} \\ \hline 4 & {6} \\\ \hline 5 & {4} \\ \hline\end{array}$$
For each of the following data sets, create a stem plot and identify any outliers. The height in feet of 25 trees is shown below (lowest to highest). 25, 27, 33, 34, 34, 34, 35, 37, 37, 38, 39, 39, 39, 40, 41, 45, 46, 47, 49, 50, 50, 53, 53, 54, 54
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