HW11_skeleton

10.2

• 1. statistically significant
• 2. True
• 3. False
• 4. -2.33
• 5. 1.28
• 6. 1.96, -1.96

7.)

a) .032, reject the null
  
b) P=.0103

11.)

a) -1.491, do not reject
  
b) P=.136

 

17. z=0.646; The sample data does not provide enough evidence to support the claim that more than 1.9% of Lipitor users experience flu-like symptoms as a side effect.

18. z=0.69; We fail to reject the null.

 

10.3

1.)

a) 2.60
  
b) -1.72
  
c) 2.16,-2.16

12.)

a) Ho: μ=63.7
   
   H1: μ>63.7
  
b) There is a .35 probability of obtaining a sample mean height of 64.3 inches or taller from a population whose mean height is 63.7 inches.
  
c) Reject the null hypothesis because there is sufficient evidence to conclude that the mean height of women 20 years of age or older is greater today.

13.)

a) Ho: μ=22

   H1: μ>22
  
b) It's a simple random sample, n is greater than or equal to 30, and n is less than or equal to 0.05N. 
  
c) P= 0.0154, reject the null

d) We reject the null. There is sufficient evidence to suggest students who take core curriculum score better than 22 on the ACT.

14.)

a) Ho: μ=501

   H1: μ<501

b) SRS was used, n is greater than or equal to 30, and n is less than or equal to 0.05N.
  
c) P=0.0855, Reject the null

d) There is sufficient evidence to conclude that students who learn English as well as another language simultaneously score worse on the SAT Critical Reading Exam. 

15. t=-4.55, Reject the null