Exam 4: Central Tendency and Variability

EuroTravel Agency is marketing overseas trips to college students but needs to keep in mind the average student's budget when setting their rates.In order to maximize the number of trips sold, the agency decides to market to the interquartile range of the students, based on their reported budgets.Who is in this group of students?

Here is a set of data: 31, 54, 26, 42, 39, 45, 38, 42, 47.What is the median?

Here is a set of data: 44, 52, 51, 37, 49, 55, 48, 39.Compute a deviation score for the data point 51.

If you wanted to know whether judges in your state are typically male or female, what measure of central tendency would you use to describe the typical judge?

Which measure of variability is the average of the squared deviations from the mean?

We _____ when calculating the average of deviations from the mean, because the sum of all deviation scores around the mean equals zero.

The most frequently occurring score in a distribution is the:

A researcher analyzed the results of her data and calculated the variance of scores at 113.00.What is the standard deviation?

Variance is the average of deviations around the mean expressed in _____ units.

These are a basketball player's number of points scored in five games: 21, 2, 15, 19, 15.Which score seems to be an outlier?

In a sample of data that has several extremely high scores, creating positive skew, the mean:

The number of avalanche fatalities in Colorado for the last nine seasons was reported as 7, 1, 6, 6, 7, 5, 8, 2, 3.What type of distribution do the numbers represent?

If the variance for a sample is computed and it is found to be rather large, the numbers in the sample are:

A comparison of the most expensive house in a neighborhood and the least expensive house in a neighborhood would involve computation of which statistic?

Around the end-of-year holidays, such as Thanksgiving, a great amount of meat is purchased.To be prepared for the increased demand, a local grocery store manager wants to know the typical amount of ham sold at medium-sized stores around Thanksgiving.But even more than that, he wants to know how sales tend to vary around that typical amount because he wants to be prepared to sell as many hams as possible.His interest in how much sales vary will require a measure of:

The median is the number that perfectly balances the:

The interquartile range measures variability as the difference between the scores at the 25th and 100th percentiles.

Six students from a psychology class reported the number of hours of television they watch per week.Here are their data: 18, 12, 15, 14, 13, 16.The variance of the number of hours of television watched per week for this sample of six students is:

If the variance of some data is 26.84, what is the standard deviation?

A standard deviation is equal to 5.50.This number means that the numbers in the sample deviate, on the average: