Presentation on theme: "MC Notecards DO NOT WRITE ON THIS PAGE- CLASS SET"— Presentation transcript:
1 MC Notecards DO NOT WRITE ON THIS PAGE- CLASS SET After you finish your quiz, copy down each problem on a notecard and answer them.Please remember to bring your own notecards beginning Monday- The notecards will be a grade at the end of the semester, so please make sure that you are completing them and keeping up with them.If you don’t finish copying them, go online to get them. I will be looking to see you completed them on Monday. No excuses Hope you have a Wonderful time at Prom! Happy Prom Day Eve!
2 MC Notecard #5The American Medical Association (AMA) wishes to determine the percentage of obstetricians who are considering leaving the profession because of the rapidly increasing number of lawsuits against obstetricians. How large a sample should be taken to find the answer to within ±3% at the 95% Confidence level? A) 6 B) 33 C) 534 D) 752 E) 1068
3 MC Notecard #6Suppose you did 10 independent tests of the form 𝐻 𝑜 : µ=25 vs 𝐻 𝑎 : µ<25 , each at the 𝛼=.05 significance level. What is the probability of committing a Type I error and incorrectly rejecting a true 𝐻 𝑜 with at least one of the 10 tests? A) .05 B) .40 C) .50 D) .60 E) .95
4 MC Notecard #7Which of the following can affect the value of the correlation r?A change in measurement unitsA change in which variable is called x and which is called yAdding the same constant to all values of the x-variableAll of the above can affect the r value.None of the above can affect the r value.
5 MC Notecard #8There are two games involving flipping a coin. In the first game you win a prize if you can throw between 45% and 5% heads. In the second game you win if you can throw more than 80% heads. For each game would you rather flip the coin 30 times or 300 times?30 times for each game300 times for each game30 times for the first game, 300 times for the second300 times for the first game, 30 times for the secondThe outcomes of the games do not depend on the number of flips.
6 MC Notecard #9Which among the following would result in the narrowest confidence interval?Small sample size and 95% confidenceSmall sample size and 99% confidenceLarge sample size and 95% confidenceLarge sample size and 99% confidenceThis cannot be answered without knowing an appropriate standard deviation.
7 MC Notecard #10Changing from a 90% confidence interval estimate for a population proportion to a 99% confidence interval estimate, with all other things being equal,increases the interval size by 9%decreases the interval size by 9%increases the interval size by 57%decreases the interval size by 57%This question cannot be answered without knowing the sample size.
8 MC Notecard #11A population is normally distributed with mean 25. Consider all samples of size 10. The variable 𝑥 −25 𝑠 10Has a normal distributionHas a t-distribution with df=10Has a t-distribution with df=9Has neither a normal distribution or a t distributionHas either a normal or a t-distribution depending on the characteristics of the population standard deviation.