Page 274 - ABCTE Study Guide_Neat

Answer

Choice D is the correct answer. A unit of rate is equal to a unit of distance divided by a unit of time. A

meter is a unit of distance and a second is a unit of time, so , or meters per second, is a unit of rate.

Review

• The metric system is a decimal system of measurement. So metric measures of length,
mass, and volume are multiples of ten of a meter, kg, and liter, respectively.

• The customary system of measurement is the system commonly used in the United
States. It includes units such as inches, pounds, and gallons.

• Simple units are the most basic units of a system of measurement.

• Derived units are combinations of simple units.

Summarizing Data

Lesson Objective

In this lesson you will learn to represent data in multiple ways and compute ways to summarize that data. You
will also explore potential sources of bias.

Previously Covered

We spent quite a bit of time reviewing volume, surface area, and areas of different three-dimensional
figures. We've also refreshed your memory about some significant formulas and provided some extra
practice using them.

All about Data

In this section, we’ll explore various aspects of data, from collection to representation and analysis. We
won’t do it in that order, though, because it’s just more meaningful to first look at data and how it’s
represented. Then you will be able to look at data more critically. That is, you can ask yourself questions
about how the data was collected and whether it truly represents what its author says it does.

A distribution is an arrangement of values that gives information about the frequency with which they
occur. A histogram is one representation of a distribution. A frequency table is another.

The center of a distribution of values is simply the middle of that distribution. A measure of central
tendency is a way of defining the center of a distribution. Perhaps this sounds more complicated than it
really is. Just think of a measure of central tendency as one way to summarize a set of (data) values.

In this section we'll define and compute the three most common measures of central tendency: the mean,
the median, and the mode.