Math 221 - Chapter 2

Fill in the blank below. The​ _____ organizes data by recording all the values observed in a sample as well as how many times each value was observed.

What​ two-step process is used to examine​ distributions? A. See the data and graph it B. See the data and summarize it C. Gather the data and graph it D. Gather the data and analyze it

All methods used for visualizing distributions are based on which of the​ following? Choose the correct answer below. A. Make a mark that indicates how many times each value occurred in the data set. B. Make a histogram of the data. C. Pick a graph and summarize the data using that graph. D. Make a dotplot of the data.

In a​ histogram, observations are grouped into intervals called​ ____.

Changing the width of bins in a histogram​ _______.

"Relative frequency" is the same as which of the​ following? Choose the correct answer below. Bin width Proportion Frequency histogram Distribution

A stemplot is often useful in which of the following​ cases? Choose the correct answer below. A. When technology is not available and the data set is not large B. When the data has already been summarized in a histogram C. When the data set is large and technology is available to make the stemplot D. When technology is not available and the data set is large

When examining a distribution of numerical​ data, which of the following is not a feature that needs to be​ considered? Choose the correct answer below. Shape Each individual value Center Spread

When examining the shape of a distribution of numerical​ data, which of the following is not one of the three basic characteristics of a​ distribution's shape? Choose the correct answer below. A. Whether the distribution is symmetric or skewed. B. Whether any unusually large or small values are present. C. How many numbers are in the data set. D. How many mounds appear.

Fill in the blank below. A distribution of a variable in which most of the values are relatively small but that also has a few very large values is called​ ________.

Question Help If a sample of people were asked how many hours of TV they watched in a typical​ week, what shape would the data distribution be expected to​ have? Choose the correct answer below. ​Right-skewed Symmetric ​Left-skewed Bimodal

The existence of multiple mounds in a distribution is sometimes a sign of which of the​ following? Choose the correct answer below. A. The data is not from a random sample B. Two very different groups have been combined into a single collection C. The graph of the distribution was drawn incorrectly D. All the values in the data are centered around one typical value

Values so large or so small that they do not fit into the pattern of the distribution are called​ what? Choose the correct answer below. Skewed Variables Outliers None of the above

The dotplot shows the body mass index​ (BMI) for 137 randomly surveyed people from a certain country. a. A BMI of more than 40 is considered morbidly obese. Report the number of morbidly obese shown in the dotplot. b. Report the percentage of people who are morbidly obese. Compare this with a recent estimate that​ 3% of people from the country were morbidly obese.

According to the ancient Roman architect​ Vitruvius, a​ person's armspan​ (the distance from fingertip to fingertip with the arms stretched​ wide) is approximately equal to his or her height. For​ example, people 5 feet tall tend to have an armspan of 5 feet.​ Explain, then, why the distribution of armspans for a class containing roughly equal numbers of men and women might be bimodal. Select the correct answer below. A. Some students will have an armspan less than their​ height, and some students will have an armspan greater than their height. B. The class could meet at different times on different days. C. Men and women tend to have different heights and therefore different armspans. Your answer is correct. D. There is no reason why the distribution might be bimodal.

What are two commonly used graphs to display the distribution of a sample of categorical​ data? Choose the correct answer below. Bar graph and pie chart Histograms and dotplots Dotplots and bar graphs Bar graph and stemplot

What are Pareto​ charts? Choose the correct answer below. A. Bar charts that are sorted from most frequent to least frequent B. Bar charts that are sorted from least frequent to most frequent C. Histograms that are sorted from least frequent to most frequent D. Dotplots that are sorted from most frequent to least frequent

Which of the following is not a difference between bar charts and​ histograms? Choose the correct answer below. A. In a bar​ chart, it​ doesn't matter how wide or narrow the bars are. B. In a bar​ chart, sometimes the order in which you place the bars​ doesn't matter. C. A bar chart is used for numerical variables while a histogram is used for categorical variables. D. In a bar​ chart, there are gaps between the bars.

Because the human eye has a difficult time judging how much area is taken up by the​ wedge-shaped slice of a pie​ chart, which of the following is true of pie​ charts? Choose the correct answer below. A. Pie charts are only used for small data sets. B. Pie charts are not commonly used by statisticians or in scientific settings. Pie charts are preferred over bar graphs. D. Pie charts are only used if they are made by a computer.

When describing the distribution of a categorical​ variable, the category that appears most often is called the​ _____.

A categorical variable is only called bimodal under what​ circumstances? Choose the correct answer below. A. Two categories are nearly tied for most frequent outcomes. The data consists of exactly two categories. C. One category occurs more frequently than any other. D. Two categories have exactly the same frequency.

Fill in the blank below. When thinking about the variability of a categorical​ distribution, it is sometimes useful to think of the word​ _______. mode shape diversity center

When summarizing graphs of categorical​ data, report the​ _______ and describe the​ _______.

What is the first step in almost every investigation of​ data? Choose the correct answer below. A. Describe the variability. B. Make an appropriate graph. Your answer is correct. C. Determine if the data contain any outliers. D. Determine the center.

2.5.RA-2 Question Help What is the most common trick to mislead readers of bar​ graphs? Choose the correct answer below. A. Change the width of the bars to make some categories appear more important than others. B. Change the scale of the horizontal axis so that it does not start at 0. C. Change the scale of the vertical axis so that it does not start at 0. Your answer is correct. D. Change the color of the bars to make some categories appear more important than others.

correct, 2.5.RA-3 Question Help Which of the following is not a way in which the Internet is influencing statistical​ graphics? Choose the correct answer below. A. Allowing for a greater variety of graphical displays B. Decreasing the use of misleading graphics Your answer is correct. C. Increasing the use of interactive displays D. None of the above