Chapter 1 Practice Test using questions from The Practice of Statistics 4th Edition Resources by Starnes, Yates & Moore.
For questions #1-8, select the best option.
Use the graph below to answer question #1.
Question 1
1.
The following bar graph gives the percent of owners of three brands of trucks who are satisfied with their truck. From this graph, we may conclude that
Question 2
2.
The population of the United States is aging, though less rapidly than in other developed countries. Above is a stemplot of the percents of residents aged 65 and older in each of the 50 states, according to the 2000 census. There are two outliers: Alaska has the lowest percent of older residents, and Florida has the highest. What is the percent for Florida?
Question 3
3.
The Interquartile range for the distribution of 50 states in the previous question is:
Question 4
4.
For the histogram above, what is the proper ordering of the mean and median? Note that the graph is NOT numerically precise—only the relative positions are important.
Question 5
5.
If a distribution is skewed to the right, which of the following is true?
Question 6
6.
The mean birth weight of infants born at a certain hospital in the month of April was 128 oz. with a standard deviation of 10.2 oz. Which of the following is a correct interpretation of standard deviation?
Question 7
7.
A medical researcher collects health data on many women in each of several countries. One of the variables measured for each woman in the study is her weight in pounds. The following list gives the five-number summary for the weights of adult women in one of the countries.
Country A: 92, 110, 120, 160, 240
About what percent of Country A women weigh between 110 and 240 pounds?
Question 8
8.
A sample of 99 distances has a mean of 24 feet and a median of 24.5 feet. Unfortunately, it has just been discovered that the maximum value in the distribution, which was erroneously recorded as 40, actually had a value of 50. If we make this correction to the data, then...
Part 2: Free Response Questions
Refer to the following setting to answer the questions.
Question 9
9.
Refer to the Body Temperatures scenario.
Determine if there are any outliers in each distribution. Show your work.
Question 10
10.
Refer to the Body Temperatures scenario.
Draw parallel boxplots of these two distributions. Be sure to use the appropriate tools, such as the shapes, label the plots and provide a scale. Use red for females and blue for males.
Question 11
11.
Refer to the Body Temperatures scenario.
Write a few sentences comparing the body temperatures of healthy males and females. Remember to use the SOCS, include context and use comparative language.
Chevrolet owners are substantially more satisfied than Ford or Toyota owners.
there is very little difference in the satisfaction of owners for the three brands.
a pie chart would have been a better choice for displaying these data.
57%
176%
13.8%
117% to 135%
2.7%
I is the median and II is the mean.
I is the mean and II is the median.
I is the mean and III is the median.
The mean must be less than the median.
It’s impossible to tell which of the above statements is true without seeing the data.
The mean and median must be equal.
The difference between the mean weight and the median weight of infants born in April was 10.2 oz.
The distance between the weight of each infant bon in April and the mean weight was, on average, about 10.2 oz.
All the infants born in April weighed between 117.8 oz. and 138.2 oz.
95%
75%
65%
50%
the mean remains the same, but the median is increased.
the mean and median are both increased.
the median remains the same, but the mean is increased.
