Exam 3: Descriptive Statistics: Numerical Measures

A sample of 9 mothers was taken. The mothers were asked the age of their oldest child. You are given their responses below. a.Compute the mean. b.Compute the variance. c.Compute the standard deviation. d.Compute the coefficient of variation. e.Determine the 25th percentile. f. Determine the median g. Determine the 75th percentile. h. Determine the range.

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

Missy Walters owns a mail-order business specializing in baby clothes. She is considering offering her customers a discount on shipping charges based on the dollar-amount of the mail order. Before Missy decides the discount policy, she needs a better understanding of the dollar-amount distribution of the mail orders she receives. Missy had an assistant randomly select 50 recent orders and record the value, to the nearest dollar, of each order as shown below. A) Determine the mean, median, and mode for this data set. B) Determine the 80^th percentile. C) Determine the first quartile. D) Determine the range and interquartile range. E) Determine the sample variance, sample standard deviation, and coefficient of variation. F)Determine the z-scores for the minimum and maximum values in the data set.

The difference between the largest and the smallest data values is the

The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated The coefficient of variation equals

The variance of the sample

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

The coefficient of variation is

The most frequently occurring value of a data set is called the

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

The mean of the sample

The measure of dispersion that is influenced most by extreme values is

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

Exhibit 3-1 A researcher has collected the following sample data. -Refer to Exhibit 3-1. The mode is

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

Exhibit 3-1 A researcher has collected the following sample data. -Refer to Exhibit 3-1. The 75th percentile is

The mean of a sample is

 is an example of a

Generally, which one of the following is the least appropriate measure of central tendency for a data set that contains outliers?

During a cold winter, the temperature stayed below zero for ten days (ranging from -20 to -5). The variance of the temperatures of the ten day period