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Exam 2: Describing Data

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Question 51

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Use the following In a survey conducted by the Gallup organization September 6-9, 2012, 1,017 adults were asked "In general, how much trust and confidence do you have in the mass media - such as newspapers, TV, and radio - when it comes to reporting the news fully, accurately, and fairly?" 81 said that they had a "great deal" of confidence, 325 said they had a "fair amount" of confidence, 397 said they had "not very much" confidence, and 214 said they had "no confidence at all". -What proportion of respondents have a fair amount of confidence in the media? Use two decimal places in your answer.

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Question 52

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Use the following Use this dataset to calculate the following summary statistics. Report each with one decimal place. -Mean

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Question 53

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Use the following In a survey conducted by the Gallup organization September 6-9, 2012, 1,017 adults were asked "In general, how much trust and confidence do you have in the mass media - such as newspapers, TV, and radio - when it comes to reporting the news fully, accurately, and fairly?" 81 said that they had a "great deal" of confidence, 325 said they had a "fair amount" of confidence, 397 said they had "not very much" confidence, and 214 said they had "no confidence at all". -What proportion of respondents have a negative opinion (not very much confidence/none at all) about the mass media? Use two decimal places in your answer.

Use the following Match the correlation to the corresponding scatterplot. -__________ 0.889

Use the following Use this dataset to compute each of the following summary statistics. 2 $\quad$ 26 $\quad$ 16 $\quad$ 10 $\quad$ 7 $\quad$ 20 $\quad$ 17 -Median

Use the following Students in an introductory statistics course were asked to count the number of scars on their dominant hand (the one they write with the most) . The results are displayed in the provided boxplot. -Which answer best describes the following conclusion? "There are no students with 2 scars on their dominant hand."

Use the following February 12, 2009 marked the 200^th anniversary of Charles Darwin's birth. To celebrate, Gallup, a national polling organization, surveyed 1,018 Americans about their education level and their beliefs about the theory of evolution. The survey results are displayed in the provided two-way table. -The survey results are displayed in the segmented bar chart. Does there appear to be an association between education level and belief in the theory of evolution? If so, what does it mean about these two variables?

Students in a small statistics class were asked which was their dominant hand and if they were in a STEM (science, technology, engineering, and math) major. Their results are listed below. Use the results to construct a two-way table.

Use the following Use this dataset to compute each of the following summary statistics. 2 $\quad$ 26 $\quad$ 16 $\quad$ 10 $\quad$ 7 $\quad$ 20 $\quad$ 17 -Mean (rounded to two decimal places)

Use the following February 12, 2009 marked the 200^th anniversary of Charles Darwin's birth. To celebrate, Gallup, a national polling organization, surveyed 1,018 Americans about their education level and their beliefs about the theory of evolution. The survey results are displayed in the provided two-way table. -What proportion of respondents have a college degree? Round your answer to three decimal places.

Use the following A Fun-Size bag of M&M's contains 5 green, 3 red, 3 yellow, 4 orange, 4 blue, and 2 brown candies. -What proportion of the M&M's are green? Use four decimal places in your answer.

Use the following Students in a small statistics course collected data to determine if the length of the forearm could be used to predict the length of the foot (both measured in centimeters) . Their data are displayed in the provided table. ‪ -Based on their goal (to predict foot length from forearm length) , which variable is the explanatory variable?

Use the following The finishing time for the top 100 men in the 2011 New York Marathon are displayed in the provided figure. -Which of the following best describes the distribution of times for the top 100 male finishers in the 2011 New York Marathon?

Use the following Students in a small statistics course collected data to determine if the length of the forearm could be used to predict the length of the foot (both measured in centimeters). Their data are displayed in the provided table. ‪ -Using your model to predict the foot length for an individual with a forearm length of 45 cm would be ___________________________.

Use the following The least squares regression line is displayed on the provided scatterplot. Note that the points are displayed with numbers (each point having its own number) , rather than points. -Which point has the most extreme positive residual?

Use the following to answer questions : One of the symptoms of the flu is an elevated pulse rate. Pulse rates (in beats per minute) for n = 23 patients with the flu are provided. ‪ -Give the sample mean pulse rate. Use two decimal places in your answer.

If a distribution is roughly symmetric, which relationship between the mean and median is likely true?

Use the following Students in a small statistics course collected data to determine if the length of the forearm could be used to predict the length of the foot (both measured in centimeters). Their data are displayed in the provided table. ‪ -A scatterplot of the data collected by the students is provided. Does there appear to be a positive or negative association between these two variables? What does this mean for these two variables?

Use the following In a survey conducted by the Gallup organization September 6-9, 2012, 1,017 adults were asked "In general, how much trust and confidence do you have in the mass media - such as newspapers, TV, and radio - when it comes to reporting the news fully, accurately, and fairly?" 81 said that they had a "great deal" of confidence, 325 said they had a "fair amount" of confidence, 397 said they had "not very much" confidence, and 214 said they had "no confidence at all". -In the article, they discuss the association between political party and opinion about the media ("positive" = great deal/fair amount of confidence and "negative"= not very much confidence/none at all). The results, as percentages, are displayed in the side-by-side bar charts. Describe the association between political party and opinion about the media. Use the bar chart to estimate the proportion of individuals with positive opinions about the media for each political party.

Use the following A biologist collected data on a sample of 20 porcupines. She wants to be able to predict the body mass of a porcupine (in grams) based on the length of the porcupine (in cm). Her least squares regression equation is , where M is the mass. -Interpret the slope of the least squares regression line, in the context of the situation.