The mean equals 100. One individual scores at the 20th percentile ...

[dejastew]

The mean equals 100. One individual scores at the 20th percentile and has a raw score of 85. What is the standard deviation?
 
  What will be an ideal response?

Question 2

When a psychologist rejects the null hypothesis at the .05 level, the results of a study indicate that
 
  A) there is less than a 5 chance of getting such an extreme result if the null hypothesis is true.
  B) there is more than a 5 chance of getting such an extreme result if the null hypothesis is true.
  C) there is a 5 chance that the research hypothesis is true.
  D) there is a 95 chance that the research hypothesis is true.

[Tonny]

Answer to Question 1

SD= 17.86

Answer to Question 2

A