Exam 2: Tabular and Graphical Methods

An auto parts chain asked customers to complete a survey rating the chain's customer service as average, above average, or below average. The following table shows the results from the survey. (See the Excel Data File.) A rating of Average or Above Average accounted for what number of responses to the survey?

The following data represent the recent sales price (in $1,000s) of 24 homes in a Midwestern city (See the Excel Data File.) Suppose the data are grouped into five classes, and one of them will be "115 up to 140"-that is, {x; 115 ≤ x < 140}. The relative frequency of this class is ________.

An analyst constructed the following frequency distribution on the monthly returns for 50 selected stocks. The number of stocks with returns of 0% up to 10% is ________.

How does an ogive differ from a polygon?

Recent home sales in a suburb of Washington, D.C., are shown in the accompanying ogive. Approximate the percentage of houses that sold for less than $600,000.

When constructing a pie chart, only a few, the most frequent, categories must be included in the pie.

The following table shows average wind speeds (in miles per hour) during 15 major fires in California. (See the Excel Data File.) Construct a stem-and-leaf diagram. Were most of these storms fueled by 45+ mile-per-hour winds? Explain.

A hair stylist records the hair color of her 25 most recent appointments, classifying the color as blonde, brown, black, or red. Her data set is displayed next. (See the Excel Data File.) A) Construct a frequency and relative frequency distribution of the hair color of the stylist's customers. B) Construct a pie chart. Which hair color is the most common among the stylist's customers? C) Create a bar chart to display the frequency distribution. How many customers had black hair?

Use the following data to construct a scatterplot. What type of relationship is implied? (See the Excel Data File.)

For quantitative data, a cumulative relative frequency distribution records the proportion (fraction) of values that fall below the upper limit of each class.

When displaying quantitative data, what is an ogive used to plot?

The following is a list of five of the world's busiest airports by passenger traffic for Year 1. How many more millions of passengers flew out of Atlanta than flew out of Chicago?

Students in Professor Smith's business statistics course have evaluated the overall effectiveness of the professor's instruction on a five-point scale, where a score of 1 indicates very poor performance and a score of 5 indicates outstanding performance. The raw scores are displayed in the accompanying table. (See the Excel Data File.) What percentage of students gave professor Smith an evaluation higher than 3?

A histogram is a series of rectangles where the width and height of each rectangle represent the frequency (or relative frequency) and the width of the respective class.

When using a polygon to graph quantitative data, what does each point represent?

The following data represent the recent sales price (in $1,000s) of 24 homes in a Midwestern city. (See the Excel Data File.) Suppose the data on house prices will be grouped into five classes. The width of the classes for a frequency distribution or histogram is the closest to ________.

When constructing a frequency distribution for quantitative data classes are mutually ________ and ________.

The following frequency distribution shows the frequency of the asking price, in thousands of dollars, for current homes on the market in a particular city. What percentage of houses has an asking price under $550,000?

Students in Professor Smith's business statistics course have evaluated the overall effectiveness of the professor's instruction on a five-point scale, where a score of 1 indicates very poor performance and a score of 5 indicates outstanding performance. The raw scores are displayed in the accompanying table: (See the Excel Data File.) What is the most common score given in the evaluations?

A scatterplot depicts a positive ________ relationship, if as x increases, y tends to increase at an increasing rate.