Exam 3: Numerical Descriptive Measures

Suppose the wait to pass through immigration at JFK Airport in New York is thought to be bell-shaped and symmetrical with a mean of 22 minutes. It is known that 68% of travelers will spend between 16 and 28 minutes waiting to pass through immigration. The standard deviation for the wait time through immigration is ________.

Consider a population with data values of (See the Excel Data File.) The mode is ________.

The sample data below shows the number of hours spent by five students over the weekend to prepare for Monday's Business Statistics exam. (See the Excel Data File.) The interquartile range of the data is the closest to ________.

Janice Anooshian asks eight of her friends about the number of hours they spend daily on Facebook. Their responses are: (See the Excel Data File.) Calculate the mean, median, and mode numbers of hours her friends spent on Facebook. Does the mean accurately reflect the center of the data?

There are five rows of students seated in a marketing class. The following table shows the number of students in each row and the average score of the most recent test for that row. (See the Excel Data File.) What is the average test score for this class?

What is(are) the most widely used measure(s) of dispersion?

The following is data a veterinarian collected from some of her clients. It is a rough estimate of a dog's weight and how long the dog lived. (See the Excel Data File.) A) Calculate the covariance between a dog's weight and its life span. B) Calculate and interpret the correlation coefficient.

Automobiles traveling on a road with a posted speed limit of 65 miles per hour are checked for speed by a state police radar system. The following is a frequency distribution of speeds. (See the Excel Data File.) The standard deviation of this distribution is the closest to ________.

The owner of a company has recently decided to raise the salary of one employee, who was already making the highest salary, by 20%. Which of the following is(are) expected to be affected by this raise?

When using the empirical rule, which of the following assumptions is made?

When interpreting the covariance between variables x and y, which of the following statements is the most accurate?

The annual returns (in percent) for a sample of stocks in the technology industry over the past year are as follows: (See the Excel Data File.) The average return is the closest to ________.

The sample data below shows the number of hours spent by five students over the weekend to prepare for Monday's Business Statistics exam. (See the Excel Data File.) The sample standard deviation of the number of hours spent by the five students is the closest to ________.

For k > 1, Chebyshev's theorem is useful in estimating the proportion of observations that fall within ________.

Outliers are extreme values above or below the mean that require special consideration.

The daily high temperature in Philadelphia over an eight-day period is shown below. (See the Excel Data File.) The median for this data set is ________.

Which of the following statements about variance is the most accurate?

A bowler's scores for a sample of six games were (See the Excel Data File.) The bowler's median score is ________.

The following data represent the wait time, in minutes, for customers calling Dell technical support. (See the Excel Data File.) The interquartile range is ________.

Chebyshev's theorem is only applicable for sample data.