Exam 1

1. Metainformation

   Tag	Value
   file	Inferential_Statistics_uu-Power-816-en_uu-Power-816-en
   name	uu-Power-816-en
   section	Inferential Statistics/NHST/Power
   type	schoice
   solution	FALSE, FALSE, TRUE, FALSE
   Type	Calculation
   Language	English
   Level	Statistical Literacy

   Question

   A teacher wants to know if the current group of first-year students is performing better than last year’s freshmen. She does this by comparing the average in a randomly drawn sample of current freshmen to the average grade of all students who were freshmen last year. What is the smallest sample size at which the teacher can compare with a power of at least 90% and a $\alpha$ = .05 can note an improvement of 0.2 over last year? Here is $\sigma$ = 0.8.

   
   
   1. FALSE: 90
   2. FALSE: 135
   3. TRUE: 140
   4. FALSE: 215
   
   
   1. This answer is incorrect.
   2. This answer is incorrect.
   3. This answer is correct.
   4. This answer is incorrect.