Exam 3: Descriptive Statistics: Numerical Measures

A numerical measure of linear association between two variables is the

Which of the following symbols represents the size of the sample

The measure of location which is the most likely to be influenced by extreme values in the data set is the

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

In 2009,the average donation to the Community Kitchen was $900 with a standard deviation of $180.In 2010,the average donation was $1,600 with a standard deviation of $240.In which year do the donations show a more dispersed distribution?

The following frequency distribution shows the yearly tuition (in $1,000s)of a sample of private colleges. For the above data,compute the mean yearly tuition.(Give your answer in dollars. )

The heights (in inches)of 25 individuals were recorded and the following statistics were calculated The coefficient of variation equals

The interquartile range is used as a measure of variability to overcome what difficulty of the range?

The variance can never be

A numerical measure of linear association between two variables is the

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

The hourly wages of a sample of eight individuals is given below. For the above sample,determine the following measures: a.The mean. b.The standard deviation. c.The 25th percentile.

The last semester grades of Nancy,a freshman at a local college are shown below. The local university uses a 4 point grading system,i.e. ,A = 4,B = 3,C = 2,D = 1,F = 0.Compute Nancy's semester grade point average.

The following data show the yearly salaries of football coaches at some state supported universities. 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

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

The frequency distribution below shows the monthly expenditure on gasoline for a sample of 14 individuals. a.Compute the mean. b.Compute the standard deviation.

Marissa,a freshman at a local college,just completed 18 credit hours.Her grade report is presented below. The local university uses a 4 point grading system,i.e. ,A = 4,B = 3,C = 2,D = 1,F = 0.Compute Marissa's semester grade point average.

In 2008,the average age of students at UTC was 22 with a standard deviation of 3.96.In 2009,the average age was 24 with a standard deviation of 4.08.In which year do the ages show a more dispersed distribution? Show your complete work and support your answer.

The following frequency distribution shows the time (in minutes)that a sample of students uses the computer terminals per day. a.Compute the mean. b.Compute the variance. c.Compute the standard deviation. d.Compute the coefficient of variation.

Positive values of covariance indicate