Exam 3: Graphical Descriptive Techniques 2

The original observations cannot be determined once they are grouped into a frequency distribution.

When a distribution has more values to the left and tails off to the right,it is skewed negatively.

When two variables are linearly related,and tend to move in opposite directions,we describe the nature of their association as a negative linear relationship.

A(n)____________________ is created by plotting the value of the variable on the vertical axis and the time periods on the horizontal axis.

If we draw a straight line through the points in a scatter diagram and most of the points fall close to the line,there must be a positive relationship between the two variables.

It is typical that when taking an exam,few students hand in their exams early; most prefer to reread their papers and hand them in near the end of the scheduled exam period.Under this scenario,a histogram of exam taking times is ____________________ skewed.

The histogram below has a shape that is ____________________.

For what type of data is a histogram appropriate?

Observations that are measured at the same time represent what type of data?

Compare the spread of the two histograms below.Which of the following is true?

The number of class intervals in a histogram depends on the number of observations in the data set.

Insurance Company A representative from a local insurance agency selected a random sample of insured homeowners and recorded the number of claims made in the last three years,with the following results: ​ ​ ​ ​ -{Insurance Company Narrative} What number of claims was made by the highest proportion of homeowners?

A line chart that is flat shows no fluctuation in the variable being presented.

Electronics Company At a meeting of regional offices managers of a national electronics company,a survey was taken to determine the number of employees the regional managers supervise in the operation of their departments.The results of the survey are shown below. ​ ​ ​ -{Electronics Company Narrative} Across all of the regional offices,how many total employees were supervised by those surveyed?

Which of the following describes a positive linear relationship between X and Y?

The number of observations within each class may be found in a frequency distribution.

Electronics Company At a meeting of regional offices managers of a national electronics company,a survey was taken to determine the number of employees the regional managers supervise in the operation of their departments.The results of the survey are shown below. ​ ​ ​ -{Electronics Company Narrative} What is the cumulative relative frequency corresponding to 4 employees?

Admission to ER The following bar chart shows the type of aspirin (if any)given to 100 cardiac patients within 15 minutes of their admission to the emergency room. -{Admission to ER Narrative} Notice that the Y-axis of the bar chart does not start at a frequency of zero.Create a new bar chart of the displayed data that accurately displays the frequency for each aspirin type.

Home Care Data are collected on the number of house calls (x)made in a given week by each of 60 nurses in a certain hospital.The same data set is displayed in each of the three histograms below. ​ ​ ​ ​ ​ -{Home Care Narrative}Which graph do you think is the most appropriate display? Justify your answer.

Insurance Company A representative from a local insurance agency selected a random sample of insured homeowners and recorded the number of claims made in the last three years,with the following results: ​ ​ ​ ​ -{Insurance Company Narrative} How many homeowners are represented in the sample?