Exam 2: Describing Data

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". -Give a relative frequency table of the data. Use two decimal places in your relative frequencies.

Use the following The scatterplot shows the relationship between GPA and the number of Facebook friends for 30 students in a class. -Discuss the information contained in the scatterplot. What does it mean about GPA and number of Facebook friends?

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 no opinion on the theory of evolution? Round your answer to two decimal places.

Use the following The provided histogram displays the number of Facebook friends for students in a small statistics class. -The median number of Facebook friends is likely closest to which value?

Use the following Identify which graphical display might be appropriate in each case. The graphs you may choose from are: -Investigate the favorite type of music (country, rock, classical, etc) for the students in your class.

Each of the variables displayed in the histograms below has a mean of 14.5, a range of 8, and 59 observations. Rank the three variables according to their standard deviations, from the smallest to the largest.

Use the following The provided histogram displays the number of Facebook friends for students in a small statistics class. -The mean number of Facebook friends is closest to which value?

Use the following In a 2012 survey, Gallup asked a sample of U.S. adults if they would prefer to have a job outside the home, or if they would prefer to stay home to care for the family and home. Partial results for the individuals who expressed a preference, broken down by gender, are displayed in the two-way table. -Find the number of males who would prefer to stay at home.

Use the following The states located in the Midwestern region of the country typically experience a large number of tornados every year. The number of tornadoes from 2000-2011 for four Midwestern states (Kansas, Nebraska, South Dakota, and Iowa) are displayed in the side-by-side boxplots. -Which state has the largest IQR?

Use the following The provided Minitab output displays descriptive statistics for the amount of financial aid, in thousands of dollars, awarded to a sample of students at a large university. ‪ -What is the range of financial aid amounts?

Use the following The side-by-side boxplots compare the top 100 men's and women's finishing times in the 2011 New York Marathon. -Which group has the larger spread in its race times?

Use the following Trying to determine the number of students to accept is a tricky task for universities. The Admissions staff at a small private college wants to use data from the past few years to predict the number of students enrolling in the university from those who are accepted by the university. The data are provided in the following table. -Suppose Admissions has announced that 2,575 students have been accepted this year. Use your regression equation to predict the number of students that will enroll.

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. ‪ -Find the least squares regression equation for predicting foot length from forearm length.

Use the following Identify which graphical display might be appropriate in each case. The graphs you may choose from are: -Investigate the relationship between pulse rate (in beats per minute) and systolic blood pressure (the top number in a blood pressure reading, measured in mm Hg = millimeters of mercury) for patients at the student health center.

Use the following The states located in the Midwestern region of the country typically experience a large number of tornados every year. The number of tornadoes from 2000-2011 for four Midwestern states (Kansas, Nebraska, South Dakota, and Iowa) are displayed in the side-by-side boxplots. -Which state has an outlier?

Use the following The states located in the Midwestern region of the country typically experience a large number of tornados every year. The number of tornadoes from 2000-2011 for four Midwestern states (Kansas, Nebraska, South Dakota, and Iowa) are displayed in the side-by-side boxplots. -Which state tends to see the most tornadoes per year?

If a distribution is heavily skewed to the left, which relationship between the mean and median is most likely?

Use the following In a 2012 survey, Gallup asked a sample of U.S. adults if they would prefer to have a job outside the home, or if they would prefer to stay home to care for the family and home. Partial results for the individuals who expressed a preference, broken down by gender, are displayed in the two-way table. -What proportion of respondents would prefer a job outside of the home? Round your answer to two decimal places.

Use the following Scores on an exam (out of 100 points) given in a large introductory statistics course are displayed in the provided histogram. -Based on the histogram of exam scores, which value is likely the median exam score?

Which statistic is more resistant to outliers (or extreme data values)?