Exam 3: Numerical Descriptive Measures

Use the following to answer questions : The following table gives the frequency distribution of prices for a sample of 30 college textbooks. -The variance of the textbook prices,rounded to two decimal places,is:

According to Chebyshev's theorem,the minimum percentage of values that fall within 3 standard deviations of the mean is:

Use the following to answer questions : The points scored by a team in five basketball games are as follows: 118 124 77 99 112 -The mode of this data set is:

Use the following to answer questions : You have just recorded the waiting times for a random sample of 50 customers who visited Elmo's Pizza Shop.The following table gives the frequency distribution of waiting times (in minutes)for these customers. -The value of is:

The value of the third quartile for a data set is 65.This means that:

The mean score of 15 male students taking a test is 76 and the mean score of 12 female students taking the same test is 73.The combined mean score of the 27 male and female students is

Use the following to answer questions : The following data represent the ages of 15 people buying lift tickets at a ski area. 15 25 26 17 38 16 74 41 30 24 28 40 20 34 31 -What is the value of the upper inner fence?

The value of the 65th percentile for a data set is 82.This means that:

Outliers influence which of the following summary measures?

The annual incomes of all MBA degree holders working in Los Angeles have a bell-shaped distribution with a mean of $72,000 and a standard deviation of $6,000.According to the empirical rule,the percentage of MBA degree holders working in Los Angeles who have an annual income of $54,000 to $90,000 is approximately:

The quartiles divide a ranked data set into:

Use the following to answer questions : The waiting times (in minutes)for 11 customers at a supermarket are: 14 9 15 4 4 7 9 11 14 2 6 -The percentile rank for the customer who waited 11 minutes is:

The mean income of all MBA degree holders working in Los Angeles is $86,000 per year and the standard deviation of their incomes is $10,500 per year.According to Chebyshev's theorem,the percentage of MBA degree holders,working in Los Angeles,with an annual income of $49,250 to $122,750 is at least::

The measurement units of the standard deviation are always:

Use the following to answer questions : The waiting times (in minutes)for 11 customers at a supermarket are: 14 9 15 4 4 7 9 11 14 2 6 -The first quartile for these data is:

If a distribution is symmetric with one peak,then:

Use the following to answer questions : The times (in minutes)taken by a sample of nine students to complete a statistics test are: 52 47 57 33 39 43 52 41 36 -The range of these times is:

The empirical rule is applicable to:

Use the following to answer questions : The annual salaries of six employees of a company are as follows: $22,000 $35,000 $22,000 $46,000 $57,000 $51,000 -The variance of these salaries,rounded to the nearest dollar,is:

The procedure for obtaining the variance from the standard deviation is to: