1.
2.602
-1.729
+/- 2.179
2.
1.321
-2.426
+/- 2.449
3.
-1.379
-1.714
skip
Fail to reject Ho as the test statistic is not in the critical region.
4.
2.67
2.492
skip
Fail to reject Ho as the test statistic is not in the critical region.
5.
2.5
2.819
skip
Failing to reject Ho since the test statistic does not fall in the critical region.
(99.39, 110.21)
11.
Ho: m=67
H1: m > 67
Pvalue of .02 means that if Ho is true, that type of result would be expected in 2/100 samples.
Reject Ho because pvalue is less than significance level. Evidence suggests that people withdraw more $ from the ATM.
13.
Ho: m = 22
H1: m > 22
n > 30
t = 2.18 critical value is 1.660
Fail to reject Ho as the test statistic does not fall in the critical region. It appears that the core math cirriculum does prepare students for college.
15.
t = -4.55 critical value is -2.718 Reject Ho. Evidence suggests that hippocampal volumes in alcoholic children are less than the normal volume of 9.2cm cubed.
17.
t = 8.14 critical value is 1.685 Fail to reject Ho, as evidence suggests that high income individuals do not have higher FICO scores than regular people.
19.
Confidence interval of 35.44 through 42.36, which includes the 40.7, so I fail to reject the null hypothesis.
1.
28.869
14.041
16.047, 45.722
3.
sigma = 20.32
critical value = 13.091
Skip but feel free to sketch on a piece of paper for your benefit.
Fail to reject Ho as it does not fall in critical region
13. Feel free to use any method you want. If you use the classical method please report the value of your test statistic and your decision. Likewise if you use the pvalue method please state your pvalue and your decision. Hint: The sample standard deviation (s) is 15.20.
test statistic = 6.418 critical value = 3.325
15. Feel free to use any method you want. If you use the classical method please report the value of the test statistic and your decision. Likewise if you use the pvalue method please state your pvalue and your decision.
test statistic = 15.639 critical value = 15.639