Exam 3: Describing Data: Numerical Measures

The weekly sales from a sample of ten computer stores yielded a mean of $25,900;a median $25,000 and a mode of $24,500.What is the shape of the distribution? ___________________.

For an ordered data set with an even number of ungrouped values,half of the values will be less than the median.

A stockbroker placed the following order for a customer: $\bullet$ 50 shares of Kaiser Aluminum preferred at $104 a share $\bullet$ 100 shares of GTE preferred at $25.25 a share $\bullet$ 20 shares of Boston Edison preferred at $9.125 a share What is the weighted arithmetic mean price per share?

In a positively skewed distribution,the mode is greater than the median.

A population consists of all the weights of all defensive tackles on Sociable University's football team.They are: Johnson,204 pounds;Patrick,215 pounds;Junior,207 pounds;Kendron,212 pounds;Nicko,214 pounds;and Cochran,208 pounds.What is the population standard deviation (in pounds)?

What measure of central location cannot be determined if the distribution has an open-ended class? _____________________.

Which one of the following is referred to as the population mean?

A distribution that has the same shape on either side of the center is described as symmetrical.

Which measure of dispersion disregards the algebraic signs (plus and minus)of each difference between X and the mean?

According to Chebyshev's Theorem,what percent of the observations lie within plus and minus 1.75 standard deviations of the mean?

The sum of the deviations from the mean for the set of numbers 4,9 and 5 will equal zero.

The weights of a sample of crates ready for shipment to Moscow,Russia are (in kilograms): 103,97,101,106 and 103.What is the mean deviation?

A company's human resource department was interested in the average number of years that a person works before retiring.The sample of size 11 follows: Based on the values of the arithmetic mean,median,and mode,what is the most likely shape of the distribution? __________________.

Ten experts rated a newly developed chocolate chip cookie on a scale of 1 to 50.Their ratings were: 34,35,41,28,26,29,32,36,38 and 40.What is the mean deviation?

A variable measured at the interval or ratio level can have more than one arithmetic mean.

What does the sum of the deviations of each value from the mean equal? _____________________________________.

Three persons earn $8 an hour,six earn $9 an hour,and one earns $12 an hour.The weighted mean hourly wage is $9.

What is a characteristic of a population called? __________________.

If the variance of the "number of daily parking tickets issued" is 100,the variance is defined as

What measure of central location uses all of the observations in its calculation? ______________.