The data available below represent the average number of hours per week that a random sample of 40 college students spend online. The data are based on a study of undergraduate students and information technology. Construct a​ stem-and-leaf diagram of the data and comment on the shape of the distribution. 18.9 22.9 18.6 15.2 13.6 14.0 22.2 18.0 16.4 20.1 24.4 13.4 21.1 14.5 15.3 17.4 18.8 15.6 17.1 19.2 13.7 15.1 16.6 25.7 23.4 16.5 21.9 20.6 17.4 14.5 14.8 21.1 17.3 18.8 18.6 20.8 14.7 17.9 17.1 23.8   ​Legend:​ 13|4 represents the average 13.4 hours per week.   13   14   15   16   17   18   19   20   21   22   23   24   25

The data below represent US exports (in billions of dollars) to 18 countries in 2015  Canada 133.7 Mexico 56.8 Germany 23.5 Taiwan 18.4 Norway 16.6 China 12.0 Australia 12.0 Malaysia 8.5 Japan 67.5 UK 30.9 South Korea 26.6 France 14.4 Brazil 12.7 Belgium 12.5 Italy  8.8 Thailand 7.2 S.A 7.3 Austria 7.3 Find the mean and median.  What is the most appropriate measure of central tendency for this sample? Why?  Find the sum of squares, range, variance, and standard deviation for the sample. What is the z-score for the UK?  What is the z-score for SA? What percent of the data falls between Saudi Arabia and Norway?  What raw scores (two scores) correspond to the boundaries of the center 95% of the distribution?

A survey of 30 people was conducted about how many siblings they had. A graph was created that showed the percentage of the survey group, which had each number of siblings. The "frequency" column in the table shows the number of responses that having a certain number of siblings received.   Using appropriate and precise statistical terminology, describe the distribution and provide an explanation for the distribution being a certain way.

The following is data for the first and second Quiz scores for 8 students in a class. First Quiz Second Quiz 13 9 16 12 19 13 26 24 43 34 46 38 48 42 49 49 Plot the points in the grid below. 51015202530354045505101520253035404550   Clear All Draw: Dot Draw the best fitting trend line for the data on the grid below. For line click on the line button. Click and release at a starting point, move to the ending point and double click. 51015202530354045505101520253035404550   Clear All Draw: Line Predict the value of the second quiz score if a student had a score of 4141 on the first test.