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 shows the results from the survey: The proportion of customers who felt the customer service was Average is the closest to _______.

The dividend yields of the stocks in an investor's portfolio are shown in the following cumulative relative frequency distribution. a.Construct an ogive. b.Approximately what percent of the stocks had a dividend yield of 3% or larger?

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. What percentage of students gave professor Smith an evaluation higher than 3?

A survey of 400 unemployed people was completed at a job fair.Each person was asked to categorize his or her job interests.The accompanying relative frequency distribution was constructed. a.Construct the corresponding frequency distribution.How many of these people designated that the computer and mathematical industry was their job interest? b.Construct a pie chart.

Thirty students at Eastside High School took the SAT on the same Saturday.Their raw scores are given next. Consider a frequency distribution of the data that groups the data in classes of 1400 up to 1600,1600 up to 1800,1800 up to 2000,and so on.What graphical tool would you use to display the cumulative relative frequency of the grouped data?

The accompanying relative frequency distribution represents the last year car sales for the sales force at Kelly's Mega Used Car Center. If Kelly's employs 100 salespeople,how many of these salespeople have sold at least 35 but fewer than 45 cars in the last year?

In the accompanying stem-and-leaf diagram,the values in the stem-and-leaf portions represent 10s and 1s digits,respectively. Find the frequency associated with data values that are more than 28.

The following table shows analyst sentiment ratings for the 30 stocks listed in the Dow Jones Industrial Average. a.Construct a frequency distribution,relative frequency distribution,cumulative frequency distribution and relative cumulative frequency distribution using classes of 2 up to 4,4 up to 6,6 up to 8,and 8 up to 10. b.Construct a histogram that summarizes the data. c.What percentage of the stocks in the Dow Jones Industrial Average received a sentiment rating less than 8? d.What percentage of the stocks in the Dow Jones Industrial Average received a sentiment rating of 6 or more?

What may be revealed from a scatterplot?

Consider the following frequency distribution. What proportion of the observations are less than 21?

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. What percentage of students gave Professor Smith an evaluation of 2 or less?

For quantitative data,a relative frequency distribution identifies the proportion of observations that fall into each class.

In the following pie chart representing a collection of cookbooks,which author has more titles?

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

A bar chart may be displayed horizontally.

A city in California spent $6 million repairing damage to its public buildings in 2010.The following table shows the categories where the money was directed. How much did the city spend to fix damage caused by mold?

A high school football league recorded the average points scored per game,as well as the winning percentage,for the 10 teams in the league. Construct a scatterplot.Does scoring more points appear to be associated with a higher winning percentage?

Graphically,we can show a(n)___________ ____________ for qualitative data by constructing a pie chart or a bar chart.

In the accompanying stem-and-leaf diagram,the values in the stem-and-leaf portions represent 10s and 1s digits,respectively. What would be the frequency of the class 35 up to 45,that is {x;35 ≤ x< 45}?

Construct a stem-and-leaf diagram with the following data set. Is the distribution symmetric?