Exam 3: Graphical Descriptive Techniques II

Observations that are measured at the same time are called ____________________ data.

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

Internet Classes A survey of 25 students was conducted to determine how they rate the quality of Internet classes.Students were asked to rate the overall quality from 0 (no quality at all) to 100 (extremely good quality).The stem-and-leaf display of the data is shown below. -{Internet Classes Narrative} What percentage of the students rated the overall quality of Internet classes as being 60 or below?

A pie chart uses relative frequencies to summarize the data so including the sample size is not important.

The line chart below shows cucumber prices fluctuated from $2.00 per pound to over $4.50 per pound during the year.

Slopes and trends in a line chart appear to be less steep if you ____________________ the horizontal (time) axis.

The two most important characteristics revealed by the scatter diagram are the strength and direction of the linear relationship.

The graphical technique used to describe the relationship between two interval variables is the scatter diagram.

If when one variable increases the other one also increases, we say that there is a(n) ____________________ relationship between these two variables.

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?

The length of each line in a step-and-leaf display represents the ____________________ of that class interval defined by the stems.

The more observations we have, the ____________________ the number of class intervals we need to use to draw a useful histogram.

Compare the two histograms below.Which statement is true?

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} In what way does the original bar chart distort the data as compared to a bar chart that starts at zero on the Y-axis (frequency axis)?

Which of the following statements describes a line chart?

When one variable increases and the other decreases, we say that there is a(n) ____________________ relationship between these two variables.

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

Which of the following represents time-series data?

Can a scatter diagram be used to explore the relationship between two nominal variables? Explain why or why not.

Beef prices throughout the year (month 1 = January) are shown in the line chart below (per pound).Describe beef prices for this given year using this line chart.