Calculate the range, variance, and standard deviation for the following data, which represent students’ scores on the SAT after reading the passage. Hint: you might like to use R as a calculator to find the square root of a number. To do this, type sqrt() and within the parentheses, type in the number you want the square root of. For instance, sqrt(49) gives you 7. Don’t worry; you will not have to do many calculations by hand (6 points). 😊
66 75 72 71 55 56 72 93 73 72 72 73 91 66 71 56 59
Variance:
s2= ΣX-X2N-1
SD:
s=ΣX-X2N-1