Exam 2: Descriptive Statistics I: Elementary Data Presentation and Description

The closing share price for G.E.stock over the past seven days is shown below.Compute the standard deviation for the data.Treat the data as a population. 112, 115, 111, 116, 116, 116, 112

If a data set has an even number of observations, then the median:

Carnival Cruise Lines reported the number of passengers (in millions) it served for the past 8 years.Compute the range for the data.

A frequency distribution is:

Atlantic Power and Light tracked daily power surges over the last 500 days.Results are reported in the relative frequency table below.Compute the standard deviation for the daily power surge data.

In computing descriptive statistics from grouped data, the midpoint of each interval is treated as a representative value for all of the group members.

A descriptive measure that is NOT measured in the same units as the original data is the variance.

Below is a list of shipping costs quoted by six online retailers for the same item.Compute the average shipping cost. $3.00 $2.84 $2.40 $3.02 $2.80 $2.51

The table shows the life expectancy in years of the G8 countries (Datablog, Guardian.co.uk, July 8 2009).Treating the data as a population, what is the mean absolute deviation of life expectancy in the eight countries, in years?

Below is a frequency table showing the results of a recent customer survey done at the Mall of America in Minneapolis.Fifty shoppers were asked, "How many times did you visit the Mall last month to shop?" Determine the "less than or equal to" cumulative frequency that would be appropriate for an x value of 2 mall visits.

A data set contains only two values.The larger of the two values is 25.If the range is 12, what is the median value in the data set?

Which of the following is an accurate interpretation of the standard deviation of a population?

The age distribution of consumers who identify themselves as "frequent users" of the Internet to make purchases is shown in the table.Estimate the mean age of these frequent users.

For a sample of 10 days, Harkin Research recorded the number of visitors to Tilton.com's website.Determine the mode for the data. 100, 100, 106, 93, 89, 95, 97, 181, 99, 100

The main difference between a bar chart and a histogram is that the bars are separated in a bar chart to emphasize the fact that each class/value is a separate category/discrete value.

The number of US solar energy companies that applied for special tax credits in each of the past 11 months, according to a recent study, is shown below.Determine the median for the data. 14, 17, 12, 11, 17, 20, 11, 12, 15, 17, 20

In a recent survey, 75 college students were asked how many e-textbooks they are using this term.Survey results are as follows.Compute the standard deviation for the number of e-textbooks in use by students in the survey.Treat the data as a population.

Turcott Roof and Deck has 130 jobs scheduled for the upcoming month.The following frequency table shows the estimated time for each of the jobs.Compute the variance for the estimated completion time data.Treat the data as a population.

The degree to which a data distribution has one extended "tail" showing either unusually large or unusually small values is called:

Below is a frequency table showing the number of new restaurants opened in the city over the past 24 months.Compute the standard deviation of the number of openings data.Treat the data as a population.