University:
Missouri State University
Course:
MTH 343 | Foundations of Probability and Statistics for Teachers
Academic year:

2020
Views:

53

Pages:

10
Author:

perlesdesfees9ovd

Chapter 9 Review 1) What is Inference? An educated guess about a parameter. using data 2) What is inference based on? Sampling distributions (histograms of samples) 3) When dealing with proportions, what symbol represents the unknown population proportion (claim)? P 4) When dealing with proportions, what symbol represents the sample proportion? 5) What is the ebite form for a confidence interval? estimate & margin of error ±(1) n 2 6) What things can you do to decrease the margin of error in a confidence interval? )decrease confidence level. 2) increase sample size 7) What does being 95% confident mean? In 95% of all samples, our interwal will have our true proportion in it. 8) What are the 4 steps to a test of significance? 1- Hypotheses 3- P-value 2-Test Statistic 4-Conclusion 9) What do these tests compare? sample to claim (6) (p) 10) What is the form for a test statistic? Z=P-P P(p) n 11) What is a P-value? What is it really telling us about our sample? obability (chance) of getting our sample (or someth more extreme). It tells us how likely our sample. is, if our Ho is true. 12) What is alpha (a)? What do we use it for? The significance level. we compare our p-value to a. 13) When do we reject our Ho? When do we fail to reject it? when p-value < x. When p-value> x. 14) What does it mean if a sample is significant? The p-value < 9, so we reject Ho. -p-value 15) I have a significance level of 0.10. I get a sample that happens 8% of the time. Is it significant? What is my conclusion (reject Ho or fail to reject Ho)? yes, p-value- x=0.05. 17) If we reject our Ho at a=0.05, will we reject it at a=0.017 Why or why not? No! Example: 9=0.03 18) If we reject our Ho at a=0.01, will we reject it at a=0.05? Why or why not? yes! any thing less than 0.01 is always less than 0.05 19) Tests of significance are really looking for evidence... AGAINST the Ho (claim). 20) Whenever we do a test of significance or a confidence interval, what are the 3 things we need to check for? SRS 2) pop≥ 10.n 3) 1230 21) I have a 98% confidence interval of certain data that is (0.65, 0.78). a. Give a POSSIBLE 92% confidence interval for the same data smaller: (0.68,0.75) b. Give a POSSIBLE GOUS confidence interval for the sample data 99% larger: (0.63,0.80)