Exam 3: Descriptive Statistics

A sample was taken of the salaries of four employees from a large company.The following are their salaries (in thousands of dollars)for this year: 33,36,41,and 47.The median of their salaries is approximately

The middle value in an ordered array of numbers is called the mode.

The number of standard deviations that a value (x)is above or below the mean is the _________________.

A box and whisker plot is determined from the mean,the smallest and the largest values,and the lower and upper quartile.

Skewness and kurtosis of a data set are measures of the shape of the distribution.

A sample was taken of the salaries of four employees from a large company.The following are their salaries (in thousands of dollars)for this year: 33,36,41,and 47.The variance of their salaries is approximately

Statistical measures used to yield information about the center or the middle parts of a group of numbers are called the measures of central tendency.

If the mean of a distribution is greater than the median,then the distribution is positively skewed.

A commuter travels many miles to work each morning.She has timed this trip 5 times during the last month.The time (in minutes)required to make this trip was 34,39,41,35,and 41.The mode time required for this trip was _______.

The empirical rule says that approximately what percentage of the values would be within 1 standard deviation of the mean in a bell shaped set of data?

The coefficient of variation is unitless.

For grouped data,the mode is the class midpoint of the modal class where the model class is the class interval with the greatest frequency.

David Desreumaux,VP of Human Resources of American First Banks (AFB),is reviewing the employee training programs of AFB banks.His staff compiled the following table of regional statistics on teller training hours. What can David conclude from these statistics?

Karen Merlott,VP for Strategic Planning at a recruitment firm,recently conducts a survey to determine customer satisfaction with job placement.She distributed the survey to 45 of the most recently placed executives.Two items on a survey questionnaire them to rate the importance of "initial interview process" and "satisfaction of final job placement" on a scale of 1 to 10 (with 1 meaning "not important" and 10 meaning "highly important").Her staff assembled the following statistics on these two items. What can Karen conclude from these statistics?

The median for ungrouped raw data is more complicated to compute then the median for grouped data.

A statistics student made the following grades on 7 tests: 76,82,92,95,79,86,and 92.What is the mean grade?

David Desreumaux,VP of Human Resources of American First Banks (AFB),is reviewing the employee training programs of AFB banks.His staff reports several statistics for teller training hours.The mean is 20 hours,the standard deviation is 5 hours,the median is 15 hours,and mode is 10 hours.The Pearsonian coefficient of skewness for teller training hours is __________.

The following frequency distribution was constructed for the wait times to check out at the grocery store. The frequency distribution reveals that the wait times to check out at the grocery store are _______.

The average of the squared deviations about the arithmetic mean is called the variance.