Exam 3: Describing Data: Numerical Measures

A statistic computed by summing all of the values of a distribution and dividing by the number of values is called the __________.

When computing the mean, the smallest value

What are the similarities and differences between the application of Chebyshev's theorem and the Empirical rule?

The value that occurs most often in a set of data is called the ________.

The Investment Research Institute reported in its Mutual Fund Fact Book that the number of mutual funds increased from 5725 in 1999 to 7977 in 2009. What is the geometric mean annual percent increase in the number of funds?

Consider two populations with the same mean. Since they have the same mean, then:

If the variance of the "number of daily parking tickets issued is 100, the standard deviation is defined as the _____________.

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

Cook County public safety monitors the number of "driving under the influence" arrests and is interested in the distribution of arrests in the month of December over the last five years. The data are shown next. What is the sample variance?

The net incomes (in $millions) of a sample of steel fabricators are $86, $67, $86, and $85. What is the modal net income?

For a data set, half of the observations are always greater than the ____.

The sum of the differences between sample observations and the sample mean is equal to _______.

The Sea Mist Hotel collects customer satisfaction data daily. Yesterday, the hotel was 99% occupied and the manager wanted to quickly assess customer satisfaction. She randomly selected 10 scores. The maximum score is 100 points. The mean score is 82.1. The 10 scores were: What is the standard deviation?

A question in a market survey asks for a respondent's favorite car color. Which measure of central location should be used to summarize this question?

What is the lowest level of measurement to which a median can be computed?

Each person who applies for an assembly job at Robert's Electronics is given a mechanical aptitude test. One part of the test involves assembling a plug-in unit based on numbered instructions. A sample of the length of time it took 42 persons to assemble the unit was organized into the following frequency distribution. What is the standard deviation (in minutes)?

The measure of central location that uses all of the observations in its calculation is called the ___________.

A sample of wires coming off the production line was tested for tensile strength. The statistical results (in PSI) were the following: According to the Empirical rule, the middle 95% of the wires tested had a tensile strength between approximately what two values?

What are the similarities and differences between the range and the standard deviation?

The net annual sales of a sample of small retail clothing stores were organized into the following relative frequency distribution. What is the mean net sales (in $ millions)?