HW11_skeleton

10.2

• 1. statistically significant
• 2. False
• 3. False
• 4. 2.22
• 5. -1.28
• 6. +/- 1.98

7.)

a) test statistic is 2.31, and we reject H0 
  
b) p value is .0104

11.)

a) test statistic is -1.49 and we fail to reject the null hypothesis
  
b) p value is .1362

 

17. test statistic is .652 and we fail to reject H0.

18. test statistic is .63 and we fail to reject H0.

 

10.3

1.)

a) 2.602
  
b) -1.729
  
c) +/-2.179

12.)

a) Ho: mew=63.9 inches
   
   H1: mew does not equal 63.9 inches
  
b) p value=.35, the likelihood that women of 20 years or older will have a mean height of 63.9 inches
  
c) If the test statistic is greater than 1.303, then we reject H0

13.)

a) Ho: mew=22

   H1:mew > 22
  
b) random sample, 200>30--so this is verified
  
c) test statistic is 2.176, so we reject H0

d) There is sufficient evidence to conclude that students who complete the core curriculum are ready for college math

14.)

a) Ho: mew=501

   H1: mew<501

b) random sample, 100>30, so this is verified
  
c) p value is .075, so we reject H0

d) There is sufficient evidence to conclude that students who learn english plus another language simultaneuously score worse on the SAT Critical Reading Exam

15. test statistic is -4.55 so we fail to reject H0.