Exam 4: Descriptive Statistics

Craig operates a part-time snow-plowing business using a 2002 GMC 2500 HD extended cab short box truck.Describe Craig's gasoline mileage based on this box plot of 195 tanks of gas.

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 2,1,5,1,1,3,4,3,1,1,5,18.For this sample,which measure of center is least representative of the "typical" student?

Chebyshev's Theorem says that at least 95 percent of the data lie within 2 standard deviations of the mean.

A certain health maintenance organization (HMO)examined the number of office visits by each of its members in the last year.For this data set,we would anticipate that the geometric mean would be

If samples are from a normal distribution with μ = 100 and σ = 10,we expect

Three randomly chosen Colorado students were asked how many times they went rock climbing last month.Their replies were 5,6,7.The coefficient of variation is

Which Excel function is designed to calculate z = (x − μ)/σ for a column of data?

A population consists of the following data: 7,11,12,18,20,22,25.The population variance is

The second quartile is the same as the median.

Which is not a measure of variability?

If Excel's sample kurtosis coefficient is negative,we conclude that

Which is not true of the Empirical Rule?

If there are 20 data values,the median will be halfway between two data values.

When a sample has an odd number of observations,the median is the

The 25th percentile for waiting time in a doctor's office is 19 minutes.The 75th percentile is 31 minutes.Which is incorrect regarding the fences?

The mean of a population is 50 and the median is 40.Which histogram is most likely for samples from this population?

A data set with two values that are tied for the highest number of occurrences is called bimodal.

The heights of male students in a certain statistics class range from Xmin = 61 to Xmax = 79.Applying the Empirical Rule,a reasonable estimate of σ would be

Below are the ages of 21 CEOs.Find the mean,median,and mode.Are there any o utliers? Explain.46,48,49,49,50,52,54,55,57,57,58,59,60,61,62,62,63,63,65,67,75

As a measure of variability,compared to the range,an advantage of the standard deviation is that it