Exam 2: Describing Data

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. ‪ -Find the standard deviation of the pulse rates. Use two decimal places in your answer.

Use the following Identify which graphical display might be appropriate in each case. The graphs you may choose from are: -Investigate the relationship between gender and left/right handedness for students in the class.

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. ‪ -If the forearm and foot lengths had been measured in inches instead of centimeters the correlation would be different.

Use the following Match the correlation to the corresponding scatterplot. -__________ -0.701

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. ‪ -Is the largest financial aid amount an outlier? Show your work to justify your answer.

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. -Calculate the IQR for the distribution of the number of scars students have.

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. -The mean can be determined exactly from the boxplot.

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. -If it would make sense, provide a clear interpretation of the intercept of the regression line, in context. Otherwise, explain why the interpretation does not make sense.

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. ‪ -Based on the output, give an interval that is certain to contain the 15th percentile of the distribution of financial aid amounts.

Use the following Scores on an exam (out of 100 points) given in a large introductory statistics course are displayed in the provided histogram. -Which best describes the shape of the distribution of exam scores?

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 non-believers have a high school education or less? Use four decimal places in your answer.

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. -Find the least squares regression line for predicting the number enrolled from the number accepted.

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 -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 IQR of financial aid amounts?

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. ‪ -Based on the mean and median financial aid amounts displayed in the summary, which of the following most likely describes the shape of the distribution of financial aid amounts?

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 -Q1

Use the following The scatterplot shows the relationship between GPA and the number of Facebook friends for 30 students in a class. -The correlation between GPA and the number of Facebook friends is -0.686. Should you go "unfriend" some of your Facebook friends if you want to improve your GPA (i.e., can you conclude that having more Facebook friends lowers GPA)? Explain briefly.

Use the following Identify which graphical display might be appropriate in each case. The graphs you may choose from are: -Investigate the relationship between the length of the right foot (in cm) and the length of the right forearm (in cm) for students in your class.

Use the following The midrange is another way to measure of the center of a distribution. The midrange of a dataset is defined to be the average of the minimum and maximum values in the dataset. -Calculate the midrange of this dataset.

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