Exam 3: Descriptive Statistics

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 _______.

A business analyst is considering a data set reflecting the number of products purchased at one time, there is a minimum of 45 and a maximum of 61.Given that the data set the number of products purchased for 5,791 purchases, the number of values at the mode would be expected to be ________.

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 hourly production of a plastic cup company is tracked over several months and is found to be normally distributed.Given a mean of 15,630 cups and a standard deviation of 251 cups, about what percent of all hours of production should produce between 15,379 and 15,881 cups?

According to Chebyshev's theorem how many values in a data set will be within 3 standard deviations of the mean?

Jessica Salas, President of Salas Products, is reviewing the warranty policy for her company's new model of automobile batteries.Life tests performed on a sample of 100 batteries indicated: (1)an average life of 75 months, (2)a standard deviation of 5 months, and (3)a bell-shaped battery life distribution.Approximately 68% of the batteries will last between ________________.

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.

The following frequency distribution was constructed for the wait times in the emergency room. The frequency distribution reveals that the wait times in the emergency room are _______.

A sample of 117 records of the selling price of homes from Feb 15 to Apr 30, 2018 was taken from the files maintained by the Albuquerque Board of Realtors.The following are summary statistics for the selling prices. Variable Mearn Mirirmum Q1 Mediarl Q3 Maxirmlum Prices 117 106270 54000 77650 96000 121750 215000 From this we can conclude that,

Considering sales levels at each hour of operation in a shoe store, a business analyst finds that the mode is between 3pm and 4pm each day.The analyst could conclude that ___________.

A statistics student made the following grades on the first 6 tests: 76, 82, 92, 95, 92, 86.The total number of tests for the semester is 7.If the median score for the whole semester was 92, what could not have been the score of the last test?

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?

A business analyst could use descriptive statistics of skewness to determine if the empirical rule could appropriately be applied to a variable.

Karen Merlott, VP for Strategic Planning at a recruitment firm, recently conducted a survey to determine customer satisfaction with job placement.She distributed the survey to 45 of the most recently placed executives.Two items on the survey asked 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. Iritial Interview Process Satisfaction of Final Job Placernent Mearl 8.5 7.5 Mediarn 9 8.5 Mode 9.0 9 Standard Deviation 1.0 1.5 What can Karen conclude from these statistics?

The mean life of a specialized essential electronic component in one of your company's main products is 80 months, and its standard deviation is 6 months.It is known that the life for this component is not normally distributed.We can conclude that at least 96% of these components will last between _______.

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

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 _______.

Considering sales levels at each hour of operation in a shoe store over the past year, a business analyst looks at a histogram that has the selling hours of the day along the horizontal axis and the frequency of sales along the vertical axis.The analyst notices that the distribution is left skewed.From this, the analyst could conclude that ___________

The lowest appropriate level of measurement for the median is ordinal.

The coefficient of variation is unitless.