The National Institute of Mental Health reported in the past that ...

[mpobi80]

The National Institute of Mental Health reported in the past that 20 of adult Americans suffer from a certain psychiatric disorder. A researcher would like to assess if the psychiatric disorder rate has been on the rise (that is, is currently higher than 20). A random sample of 80 adult Americans undergo an examination and 20 resulted in having a psychiatric disorder. Is this sufficient evidence to suggest the rate has significantly increased at a 5
   significance level? At the 5 significance
   level, which is the appropriate conclusion?

  1.Based on this data there is not sufficient evidence to say the rate is higher than 20.
  2.Based on this data there is sufficient evidence to say the rate is higher than 20.

Question 2

The National Institute of Mental Health reported in the past that 20 of adult Americans suffer from a certain psychiatric disorder. A researcher would like to assess if the psychiatric disorder rate has been on the rise (that is, is currently higher than 20). A random sample of 80 adult Americans undergo an examination and 20 resulted in having a psychiatric disorder. Is this sufficient evidence to suggest the rate has significantly increased at a 5
   significance level? Are the results
   statistically significant at the 5 level?

  1.Yes
  2.No

[ebenov]

Answer to Question 1

1

Answer to Question 2

2

[mpobi80]

Gracias!

[dantucker]

Excellent