AP Statistics 1-2

Students in a college statistics class responded to a survey designed by their teacher. One of the survey questions was “How much sleep did you get last night?” Here are the data (in hours). On your own paper make a dotplot to display the data. I will look at this in class.

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Students in a college statistics class responded to a survey designed by their teacher. One of the survey questions was “How much sleep did you get last night?” Here are the data (in hours). Describe the overall pattern of the distribution and any deviations from that pattern.

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Earlier, we examined data on the number of goals scored by the U.S. women’s soccer team in games during the 2004 season. The dotplot below displays the goal differential for those same games, computed as U.S. score minus opponent’s score. Explain what the two dots above −2 represent.

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Earlier, we examined data on the number of goals scored by the U.S. women’s soccer team in games during the 2004 season. The dotplot below displays the goal differential for those same games, computed as U.S. score minus opponent’s score. What does the graph tell us about how well the team did in 2004? Be specific.

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On your own paper below the other question you did earlier, sketch a dotplot for a distribution that is skewed to the left. I will look at this in class.

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Suppose that you and your friends emptied your pockets of coins and recorded the year marked on each coin. The distribution of dates would be skewed to the left. Explain why.

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Dr. Amabile conducted a study involving college students, who were divided into two groups using a chance process (like drawing names from a hat). 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 playing with words. Both groups were then instructed to write a poem about laughter. Each student’s poem was rated separately by 12 different poets using a creativity scale. The 12 poets’ ratings of each student’s poem were averaged to obtain an overall creativity score. A dotplot of the two groups’ creativity scores is shown below. Compare the two distributions. What do you conclude about whether external rewards promote creativity?

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Given is a stemplot of the percent of residents aged 25 to 34 in each of the 50 states. The stems are whole percents, and the leaves are tenths of a percent. This time, each stem has been split in two, with values having leaves 0 through 4 placed on one stem, and values ending in 5 through 9 placed on another stem. Why did we split stems?

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It appears that El Niño, the periodic warming of the Pacific Ocean west of South America, affects the monsoon rains that are essential for agriculture in India. Here are the monsoon rains (in millimeters) for the 23 strong El Niño years between 1871 and 2004:

To make a stemplot of these rainfall amounts, round the data to the nearest 10, so that stems are hundreds of millimeters and leaves are tens of millimeters. Make two stemplots, with and without splitting the stems on the same paper as your other graphs from this assignment. Which plot do you prefer?

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Here are the amounts of money (cents) in coins carried by 10 students in a statistics class: 50, 35, 0, 97, 76, 0, 0, 87, 23, 65. To make a stemplot of these data, you would use stems

• 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.

• 0, 2, 3, 5, 6, 7, 8, 9.

• 0, 3, 5, 6, 7.

• 00, 10, 20, 30, 40, 50, 60, 70, 80, 90.