Exploring Data

Which of the following numerical summary measures cannot be negative?

• mean

• standard deviation

• z-score

• mode

• Q3

A graphical display of a data set is given. Identify the overall shape of the distribution.

A stem-and-leaf diagram is given below for the ages of the patients at a hospital.

[see image]

Which of the following best describes the shape of the distribution?

• Bimodal

• Symmetric

• Skewed to the left

• Skewed to the right

The mean is less than the median

• when the data is skewed to the right

• when the data is skewed to the left

• when the data is symmetric

• never

Which of the following numerical summary measures cannot be easily approximated from a box plot?

• variance

• interquartile range

• median

• range

• Q1

Each year advertisers spend billions of dollars purchasing commercial time on network sports television. A recent article listed the top 10 leading spenders (in millions of dollars) over a 6 month period:

[see image]

Which of the following graphs would not be appropriate for displaying this data?

• Pie chart

• None of these should be used.

• Dot plot

• Stem-and-leaf plot

• Histogram

What type of statistical investigation is this?

• Relationships

• Comparison

• Time series

• Probabilities

What type of statistical investigation is this?

• Relationships

• Comparison

• Time series

• Probabilities

Which is the correct "variable" type for this set of data

• Categorical

• Discrete

• Continous

Which is the correct "variable" type for this set of data

• Categorical

• Discrete

• Continous

Which is the correct "variable" type for this set of data

• Categorical

• Discrete

• Continous