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Chapter 2: Q. 2.9 (page 82)
The following data represent the number of employees at various restaurants in New York City. Using this data, create a histogram.
and
Use as the first interval.
The histogram of the 22 students who were sampled is as follows:
Histogram of number of employee
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The following data set shows the heights in inches for the boys in a class of students.
The following data set shows the heights in inches for the girls in a class of students.
Construct a box plot using a graphing calculator for each data set, and state which box plot has the wider spread for the middle of the data.
Twenty-five randomly selected students were asked the number of movies they watched the previous week. The results are as follows:
a. Find the sample mean .
b. Find the approximate sample standard deviation, s.
A music school has budgeted to purchase three musical instruments. They plan to purchase a piano costing 3,000, a guitar costing 550, and a drum set costing 600. The mean cost for a piano is 4,000 with a standard deviation of 2,500. The mean cost for a guitar is 500 with a standard deviation of 200. The mean cost for drums is 700 with a standard deviation of 100. Which cost is the lowest, when compared to other instruments of the same type? Which cost is the highest when compared to other instruments of the same type. Justify your answer.
Use the following information to answer the next two exercises. Sixty-five randomly selected car salespersons were asked the number of cars they generally sell in one week. Fourteen people answered that they generally sell three cars; nineteen generally sell four cars; twelve generally sell five cars; nine generally sell six cars; eleven generally sell seven cars.
Looking at your box plot, does it appear that the data are concentrated together, spread out evenly, or concentrated in some areas, but not in others? How can you tell?
In a survey, people were asked how many times they visited a store before making a major purchase. The results are shown in Table .
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