Exam 3: Descriptive Statistics: Numerical Measures

A sample of charge accounts at a local drug store revealed the following frequency distribution of unpaid balances. a.Determine the mean unpaid balance. b.Determine the variance. c.Determine the standard deviation. d.Compute the coefficient of variation.

For the following frequency distribution, a.Compute the mean. b.Compute the standard deviation. (Assume the data represent a population.)

In a statistics class, the average grade on the final examination was 75 with a standard deviation of 5. Use Chebyshev's theorem to answer the following questions. a.At least what percentage of the students received grades between 50 and 100? b.Determine an interval for the grades that will be true for at least 70% of the students. (Hint: First, compute the Z-score.)

The following data show the yearly salaries of a sample of MBA graduates. a.Compute the mean yearly salary and give your answer in dollars. b.Compute the standard deviation and give your answer in dollars. c.Compute the 75th percentile and give your answer in dollars. Fully explain what the value that you have determined indicates.

Exhibit 3-1 The following data show the number of hours worked by 200 statistics students. -Refer to Exhibit 3-1. The number of students working 19 hours or less

The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated.mean = 160 range = 60 Mode = 165 Variance = 324 Median = 170 The coefficient of variation equals

The geometric mean of 1, 3, 5, and 6 is

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

The following data show the yearly salaries of a random sample of Chattanooga residents. For the above sample, determine the following measures (Give your answer in dollars): a.The mean yearly salary. b.The standard deviation. c.The mode. d.The median. e.The 70th percentile

The variance of the sample

Exhibit 3-2 A researcher has collected the following sample data 5 12 6 8 5 6 7 5 12 4 -Refer to Exhibit 3-2. The mean is

Descriptive statistics for the closing stock prices of two companies for several trading periods are shown below. a.Which company's stock price has a more dispersed distribution? Explain. Show your complete work and support your answer. b.Compare the Skewness of the two and explain what is indicated.

Exhibit 3-5 You are given the following frequency distribution. -Refer to Exhibit 3-5. The standard deviation is

In computing descriptive statistics from grouped data,

The hourly wages of a sample of 130 system analysts are given below. mean = 60 Range = 20 Mode = 73 Variance = 324 Median = 74 The coefficient of variation equals

Which of the following is a measure of dispersion?

Exhibit 3-1 The following data show the number of hours worked by 200 statistics students. -Refer to Exhibit 3-1. The cumulative relative frequency for the class of 10 - 19

The relative frequency of a class is computed by

Which of the following symbols represents the standard deviation of the population?

Exhibit 3-2 A researcher has collected the following sample data 5 12 6 8 5 6 7 5 12 4 -Refer to Exhibit 3-2. The 75th percentile is