The head circumference is measured for 25 girls and their twin ...

[penza]

The head circumference is measured for 25 girls and their twin sisters. What is the value of the multiplier t for a 90 confidence interval for the difference in mean head circumference between girl twins?
 a. 1.68
  b. 2.02
  c. 1.71
  d. 2.06

Question 2

In each situation, indicate whether it would make more sense to find a confidence interval for the population parameter or to conduct a hypothesis test for a specific null value. If your answer is a hypothesis test, specify the null value that you would test. Dyslexia is a broad term defining a learning disability that impairs a person's ability to read, speak, and spell. It is believed that dyslexia can affect between 5 to 10 percent of the population although there have been no studies to indicate an accurate percentage.

[aburgess]

Answer to Question 1

C

Answer to Question 2

Confidence interval

[penza]

Wow, this really help

[scottmt]

Gracias!