HW11_skeleton

10.2

• 1. Statistically Significant.
• 2. True.
• 3. False.
• 4. 1.28
• 5. -1.28
• 6. 2.58

7.)

a) 2.31, Reject the Null.
  
b) .0104 < 0.05 (alpha), Reject the Null

11.)

a) -1.49, Do not reject the Null.
  
b) .0681 > .05, Do not reject the Null.

 

17. 2.33, Do not reject.

18. .6302, Fail to reject.

 

10.3

1.)

a) 2.602
  
b) 1.729
  
c) 2.179

12.)

a) Ho: mu = 63.7 in.
   
   H1: mu > 63.7 in.
  
b) The P value, in this case .35, represtents the probability     that the sample mean is 63.7 in or greater.
  
c) Because the P value is greater than alpha, we fail to          reject the Null hypothesis.

13.)

a) Ho: mu = 22

   H1: mu > 22
  
b) The sample size (200) is greter than 30.
  
c) 2.1757

d) 2.1757 > 1.660, Reject Null hypothesis. There is evidence      to suggest that students who take the core curriculum score       higher than 22 on the math ACT.

14.)

a) Ho: mu = 501

   H1: mu < 501

b) the sample size (100) is greater than 30.
  
c) -1.3793 > 1.299

d) Reject the Null hypothesis because 1.3793 is more extreme      than 1.299

15. -4.554 > -2.681, Reject the Null hypothesis.