Elana recorded the height of all of her classmates and calculated the standard deviation. If everything else stayed the same, what change to the data would make the standard deviation incr A B C (D) E If the tallest person were taller If the shortest person were taller If everyone in the class were one inch taller If the tallest and shortest person were removed from the data set If someone whose height was exactly equal to the mean were added to the data set

Two teachers have a friendly rivalry. They want to know which of their students did better on their respective final exams. The first teacher teaches chemistry and her 49 students had a mean = 68. The national mean and standard deviation for this exam is 65 and 10, respectively. The second teacher teaches history and his 64 students had a mean = 72. The national mean and standard deviation for this exam is 70 and 7, respectively. Taking into account the average performance of students on chemistry and history exams nationwide, which teachers' students did better on their respective final exams?

For fun a medical school professor once made a class of med students jump up and down for 1 minute and then measure their heart rate. Below are the values that were recorded: 136 144 99 145 135 125 115 127 124 101 100 103 130 119 121 123 116 115 126 114 125 125 116 137 152 Using StatCrunch - report back to the class the mean, median, and std deviation for the data by pasting the output into Word and attaching it to your post. Graph the data as a histogram with a fit to a Normal curve and include this in your Word document.   One of the students had a rate of 127 and exclaimed, "I am in better shape than all you people!" Compute a z score to prove them right or wrong.

Please find a,b,c and d