Statistics

If the graph of a frequency distribution has a peak and the data tapers off more slowly to the right and more quickly to the left, the distribution is said to be ____________.

right-skewed

If data is clustered at one end or the other, it indicates that there is a __________.

skewed distribution

The range 33.17 - 35.63 is not a good choice for class boundaries because

the class limits are difficult to interpret

A weatherman records the amount of rain that fell in Portland, Oregon each day for a year. What type of graph should he use to show how rainfall changes during the year ?

time series graph

The three most commonly used graphs in research are the histogram, the __________, and the cumulative frequency graph (ogive).

frequency polygon

Exaggerating a one-dimensional increase by showing it in two dimensions is an example of a

misleading graph.

The ________ level of measurement exhausts categories in which no order or ranking can be imposed on the data.

nominal

Detached statistics occur when subjects are

not compared

A Pareto chart does not have which of the following properties?

quantitative variable on the horizontal axis

What are the boundaries of the class 11-17?

10.5 and 17.5

What is the midpoint of the class 4-18?

11

What is the lower class limit in the class 13-17?

13

What is the midpoint of the class 15-18 ?

16.5

For the class 5 - 20, the upper class limit is

20

An automobile dealer wants to construct a pie graph to represent types of cars sold in July. He sold 72 cars; 16 of which were convertibles. The convertibles will represent how many degrees in the circle?

80 degrees

discrete

A ______________ variable assumes values that can be counted

True

A dependent variable can also be referred to as an outcome variable.

52

A linear regression line y = 0.8x - 10 is computed to predict the final exam score y on the basis of the first score x on the first test. Suppose Maria scores a 78 on the first test. What would be the predicted value of her score on the final exam?

88

A linear regression line y = 10 + 0.9x is computed to predict the final exam score y on the basis of the first score x on the first test. Suppose Maria scores a 87 on the first test. What would be the predicted value of her score on the final exam?

False

A person's hair color would be an example of a quantitative variable

True

A positive relationship exists when both variables increase or decrease at the same time

What of the following correctly describes the relationship between a sample and a population?

A sample is a group of subjects selected from a population to be studied

Which of the following correctly describes the relationship between a sample and a population?

A sample is a group of subjects selected from a population to be studied

Which graph should be used to represent the frequencies with which certain courses are taken at Highlands Middle School?

Pareto chart

detached statistics

An advertisement for a lawn mower states that it is 10% more powerful than it's competitor. This is an example of

False

Data can be classified as qualitative, continuous, or nonsequential.

A statistics student obtains a sample data from one of his classes and finds that the average student takes 5.2 classes.

Discrete

For a given data set, the ogive and the frequency polygon will have the same overall shape

False

Class Midpoint

For grouped frequency distributions, the __________ is obtained by adding the lower and upper limits and dividing by 2.

True

If every 13th customer leaving a movie were surveyed, this would be an example of systematic sampling

nominal

If you classified the fruit in a basket as apple, orange, or banana, this would be an example of which level of measurement?

sampling.

If you were told that four students from a class of twenty were questioned for a grade versus test preparation poll, this would be an example of

quasi-experimental study

In a true experimental study, the subjects should be assigned to groups randomly. If this is not possible and a researcher uses intact groups, they are performing a

True

Inferential statistics is based on probability theory

TRUE

Methods commonly called traditional statistics include using measures of position, Chebyshev's theorem, and the coefficient of variation.

When data are collected in original form, they are called __________.

Raw Data

A stem and leaf plot is useful for

Showing the distribution of costs of textbooks for various courses

Class Midpoint

The _____ is obtained by adding the lower and upper limits then dividing by 2

steam and plot graph

The ______ retains the actual data while showing them in graphical form.

Histogram

The ________ is a graph that displays the data by using contiguous vertical bars (unless the frequency of a class is 0) of various heights to represent the frequencies of the classes

Frequency

The __________ is the number of values in a specific class of distribution.

Ordinal

The _______________ level of measurement classifies data into categories that can be ranked; however, precise differences between the ranks do not exist.

True

The lower class limit represents the smallest data value that can be included in the class

False

The number of birds in a tree is an example of a continuous variable.

Ratio

The number of people from the state of Alaska who voted for a Republican in the last election is an example of the ______________ level of measurement.

Scatter plot

The possible relationship between pairs of data values could be examined from a

A pie graph is not useful to show which of the following characteristics of data?

The trend of the data over time

A time series graph represents data that occur over a specific time period

True

An ogive is also called a cumulative frequency graph.

True

The frequency polygon and the histogram are two different ways to represent the same data set

True

When two sets of data are compared on the same graph using two lines, it is called a compound time series graph.

True

When two sets of data collected over specific periods of time are compared on the same graph using two lines, it is called a compound time series graph.

True

35.5

Using the class 23-35, what is the upper class boundary?

random variables

Variables with values that are determined by chance are called

13

What is the lower class limit in the class 13-17?

parameter

What is the term for a characteristic or measure obtained by using all the data values for a specific population?

nominal

What level of measurement classifies data into mutually exclusive (non-overlapping), exhaustive categories in which no order or ranking can be imposed on the data?

Descriptive statistics

__________ consists of the collection, organization, summarization, and presentation of the data

Hypothesis testing

______________ is a decision-making process for evaluating claims about a population, based on information obtained from samples.

Thirty students recorded the colors of their eyes, choosing from the colors brown, blue, green, hazel, and black. This data can be appropriately summarized in a(n)______________

categorical frequency distribution

A frequency distribution is the organization of raw data in table form, using _____ and _____.

classes; frequencies

Statistics is the science of conducting studies to

collect, organize, summarize, analyze, and draw conclusions from data.