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Chapter 1: Q 108. (page 77)
Healthy fast food? Refer to Exercises 102 and 106. Identify any outliers in the distribution. Show your work.
There are no outliers.
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Protecting woodWhat measures can be taken, especially when restoring historic wooden buildings, to help wood surfaces resist weathering? In a study of this question, researchers prepared wooden panels and then exposed them to the weather. Some of the variables recorded were type of wood (yellow poplar, pine, cedar); type of water repellent (solvent based, water-based); paint thickness (millimeters); paint color (white, gray, light blue); weathering time (months). Classify each variable as categorical or quantitative.
Hotels (Introduction) A high school lacrosse team is planning to go to Buffalo for a three-day tournament. The tournament鈥檚 sponsor provides a list of available hotels, along with some information about each hotel. The following table displays data about hotel options. Identify the individuals and variables in this data set. Classify each variable as categorical or quantitative.
Enhancing creativity Do external rewards鈥攖hings like money, praise, fame, and grades 鈥攑romote creativity? Researcher Teresa Amabile recruited 47 experienced creative writers who were college students and divided them at random into two groups. The students in one group were given a list of statements about external reasons (E) for writing, such as public recognition, making money, or pleasing their parents. Students in the other group were given a list of statements about internal reasons (I) for writing, such as expressing yourself and enjoying wordplay. Both groups were then instructed to write a poem about laughter. Each student鈥檚 poem was rated separately by 12 different poets using a creativity scale. 26 These ratings were averaged to obtain an overall creativity score for each poem. Parallel dotplots of the two groups鈥� creativity scores are shown here.
Part (a). Is the variability in creativity scores similar or different for the two groups? Justify your answer.
Part (b). Do the data suggest that external rewards promote creativity? Justify your answer.
The histogram shows the heights of 300 randomly selected high school students. Which of the following is the best description of the shape of the distribution of heights?
a. Roughly symmetric and single-peaked
b. Roughly symmetric and double-peaked
c. Roughly symmetric and multi-peaked
d. Skewed to the left
e. Skewed to the right
Birth months Imagine asking a random sample of 60 students from your school about their birth months. Draw a plausible (believable) graph of the distribution of birth months. Should you use a bar graph or a histogram to display the data?
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