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 standard deviation is

Since the mode is the most frequently occurring data value,it

When data are positively skewed,the mean will usually be

The flashlight batteries produced by one of the northern manufacturers are known to have an average life of 60 hours with a standard deviation of 4 hours.Use Chebyshev's theorem to answer the following questions. a.At least what percentage of flashlights will have a life of 54 to 66 hours? b.At least what percentage of the batteries will have a life of 52 to 68 hours? c.Determine an interval for the batteries' lives that will be true for at least 80% of the batteries.(Hint: First compute the Z-score. )

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

The ages of a sample of 8 faculty members selected from the School of Business Administration are shown below. a.Compute the average age. b.Determine the mode. c.Compute the median age. d.Compute the standard deviation.

Exhibit 3-6 The closing stock price of MNM Corporation for the last 7 trading days is shown below. -Refer to Exhibit 3-6.The mode is

Exhibit 3-5 You are given the following frequency distribution. -Refer to Exhibit 3-5.The coefficient of variation is

The descriptive measure of dispersion that is based on the concept of a deviation about the mean is

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

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

When the data are skewed to the right,the measure of Skewness will be

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

Since the population is always larger than the sample,the value of the sample mean

The following is a frequency distribution of grades of a sample of statistics examinations. Compute the following measures: a.The mean b.The variance c.The standard deviation d.The coefficient of variation

The sample variance

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

The measure of dispersion which is not measured in the same units as the original data is the

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

The grade point average of the students at UTC is 2.80 with a standard deviation of 0.84.The grade point average of students at UTK is 2.4 with a standard deviation of 0.84.Which university shows a more dispersed grade distribution?