Flashcards
Stats exam 3
Flashcards do conjunto (13)
- 1Ask for volunteers to play a violent video game and then compare their similarity scores to those of students taking a psychology course.describe it there’s not random assignment
- 2Ask for volunteers, assign with a coin flip to have half play a violent video game and half play a non-violent video game, and then compare the difference in their similarity scores.cause and effect with coin flip you have a random assignment
- 3Post an announcement on Today@MC asking students to complete a questionnaire on the similarity of pairs of words and whether they play violent video games and then compare similarity scores for those who play violent video games and those who don’t.describe it can’t generalize and there’s no random assignment
- 4Use a master list of MC students to take a random sample of 180 students and have each member of your sample complete a questionnaire on the similarity of pairs of words and whether they play violent video games and then compare similarity scores for those who play violent video games and those who don’t.generalize there’s a random sample
- 5(4) The xkcd comic strip shows that after the “researchers'' conducted an overall test on jellybeans that was not significant, they went on to do 20 tests of different colors, getting excited when 1 turned up as significant…There is an “inside joke(s)” that people without a couple of semesters of statistics are likely to miss. How does the joke, that they’re getting excited about one of the 20 tests showing up as significant, relate to the statement in the newspaper headline that there is “only 5% chance of coincidence”?because there is a 5% chance of confidence you should expect 1/20, therefore them getting excited doesn't make sense.
- 6What does kj represent? If this term is significant, what would it imply about Factor A’s (represented by ) “effect” on the response Y?Ykj represents the interaction between the significance between A and B, it would imply that factor A depends on factor B inorder to be significant, Interaction effect on a and b if its significant then the effect on the Alpha depends on the
Beta - 7E represent error but is it the risk of a type I error, risk of a type II error, or the error that comes from individuals varying from each other despite being the in the same group?e is independent which means its the risk of the error that comes from the individuals varying from each other despite being in the same group.
- 8In the first week of considering two factor ANOVA’s we looked at studies on the effect of caffeine and theobromine on speed of finger taps, differences in mean prices at toy stores, differences in preparedness in math, science, English, and reading as measured by the ACT, and the effect of caffeine doses on endurance. What do the subjects in the finger-tapping study, board games in the store prices studies, students in the ACT study, and cyclists in the endurance study have in common?The blocking factors
- 9Why were these factors (subjects, board games, etc.) used in these studies?Helps to reduce error and increase consistency
- 10(8) In several of the above examples, we ultimately compared several pairs of means. An issue to address when conducting statistical tests as part of data analysis is the risk of false positives. For a single test, we know this risk is typically .05 or 5% (hence, the 95% confidence level). a. (6) If a study consists of 8 independent statistical tests, each conducted at the 95% confidence interval, what would be the risk of at least one Type I Error? (Show your work for full credit.)1-(.95)^8= .34
- 11(2) What would be the solution to the issue demonstrated in a? (Bonus points for a specific solution.)Bonferoni method-
.05/8= .00625
1-.00625= .994
99% to get a 95% conference interval - 12The Scottish poet Andrew Lang once said as a criticism of someone’s statistical analysis that “He uses statistics like a drunken man uses lampposts…for support rather thanillumination
- 13Statistician John W. Tukey was known for his brilliance and simplicity, and made numerous contributions to the field of statistics. However, in his obituary he was remembered not for a statistical contribution but for what?software
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- FlashCards sobre Stats exam 3 , criado por Cadance Kent em 21-11-2022.
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