The standard deviation of the sample data 13, 14, 17, and 20 ...

[vinney12]

The standard deviation of the sample data 13, 14, 17, and 20 equals:
 
  A) 2.74
  B) 3.16
  C) 7.98
  D) 9.16

Question 2

A professor needs to select a volunteer for a project. Which of the following would not be an example of a simple random sample?
 
  A) He chooses a number between 00 and 99. The student whose phone number has the last two digits closest to the one the professor has chosen is selected.
  B) He chooses that individual whose name is first in alphabetical order.
  C) He puts all student names in a bowl, mixes them up, and selects one.
  D) He has each student select a number between 0 and 99 and write it down. He then selects the student whose number is closest to the last two digits of his social security number.

[cici]

Answer to Question 1

B

Answer to Question 2

B

[vinney12]

TYSM

[Bigfoot1984]

Gracias!