Confidence interval for a mean Quiz

Name: ______________________   Date: __________   Score: ____ / 10

10 questions. Calculator allowed. Show your working. steplyclass.com/university-statistics/confidence-interval-for-a-mean/quiz/

1. 1

   Calculate 95% confidence interval: mean 50, sd 8, n 64
   1. A) (48.04, 51.96)
   2. B) (49.755, 50.245)
   3. C) (51.96, 48.04)

2. 2

   Calculate 90% confidence interval: mean 40, sd 6, n 36

   Answer: ____________________

3. 3

   Calculate 90% confidence interval: mean 70, sd 10, n 25
   1. A) (73.29, 66.71)
   2. B) (66.71, 73.29)
   3. C) (69.342, 70.658)

4. 4

   Calculate 95% confidence interval: mean 100, sd 20, n 100

   Answer: ____________________

5. 5

   Calculate 95% confidence interval: mean 64.5, sd 7, n 49
   1. A) (66.46, 62.54)
   2. B) (62.54, 66.46)
   3. C) (64.22, 64.78)

6. 6

   Calculate 95% confidence interval: mean 250, sd 40, n 100

   Answer: ____________________

7. 7

   Calculate 90% confidence interval: mean 36, sd 9, n 81

   Answer: ____________________

8. 8

   Calculate 95% confidence interval: mean 12.5, sd 3, n 50

   Answer: ____________________

9. 9

   Calculate 99% confidence interval: mean 4.2, sd 0.6, n 64

   Answer: ____________________

10. 10

    Calculate 90% confidence interval: mean 5.6, sd 1.5, n 20

    Answer: ____________________