Exam 3: Descriptive Statistics: Numerical Measures

Exhibit 3-4 The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. -Refer to Exhibit 3-4. The variance is

Excel's __________ function can be used to compute the population standard deviation.

The 75th percentile is also the

Exhibit 3-3 Suppose annual salaries for sales associates from a particular store have a bell-shaped distribution with a mean of $32,500 and a standard deviation of $2,500. -Refer to Exhibit 3-3. The z-score for a sales associate from this store who earns $37,500 is

Consider the data in the following frequency distribution. Assume the data represent a population. For the above data, compute the following. a.The mean b.The variance c.The standard deviation

Which of the following is not a measure of dispersion?

When the data are positively skewed, the mean will usually be

In a five-number summary, which of the following is not used for data summarization?

A set of visual displays that organizes and presents information that is used to monitor the performance of a company or organization in a manner that is easy to read, understand, and interpret is called a

Excel's __________ function can be used to compute the median.

Exhibit 3-2 A researcher has collected the following sample data. The mean of the sample is 5. -Refer to Exhibit 3-2. The range is

Excel's __________ function can be used to compute the population covariance.

A sample of 11 individuals shows the following monthly incomes. a.What would be a representative measure of central location for the above data? Explain. b.Determine the mode. c.Determine the median. d.Determine the 60th percentile. e.Drop the income of individual number 11 and compute the standard deviation for the first 10 individuals.

If the variance of a data set is correctly computed with the formula using n - 1 in the denominator, which of the following is true?

The symbol $\sigma$ is used to represent the

Del Michaels had a successful morning, or so he thinks, selling 1300 surplus notebook computers over the telephone to three commercial customers. The three customers were not equally skillful at negotiating a low unit price. Customer A bought 600 computers for $1252 each, B bought 300 units at $1310 each, and C bought 400 at $1375 each. a. What is the average unit price at which Del sold the 1300 computers? b. Del's manager told Del he expected him to sell, by the end of the day, a total of 2500 surplus computers at an average price of $1312 each. What is the average unit price at which Del must sell the remaining 1200 computers?

The following frequency distribution shows the ACT scores of a sample of students: For the above data, compute the following. a.The mean b.The standard deviation

Which of the following symbols represents the variance of the population?

The following data show the yearly salaries of football coaches at some public high schools. For the above sample, determine the following measures. a.The mean yearly salary b.The standard deviation c.The mode d.The median e.The 70th percentile

A private research organization studying families in various countries reported the following data for the amount of time 4-year old children spent alone with their fathers each day. For the above sample, determine the following measures: a.The mean b.The standard deviation c.The mode d.The 75th percentile