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STAT 217 Cal Poly Questions with Correct Answers (Grade A+)

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STAT 217 Cal Poly Questions with Correct Answers (Grade A+) Question 1: BIG sample size for errors Answer: makes TYPE 2 GREATER, no impact on type I Question 2: Power Answer: the probability we reject null hypothesis when null is false, we want HIGH probability ex: probability of committing type 2 is 24%, so power is 76% Question 3: bigger alpha value Answer: -easier to reject null -easier to detect when null is false -HIGHER POWER Question 4: sample size is bigger (power) Answer: -sample statistics will be close to true value -HIGHER POWER Question 5: scatterplots Answer: -2 quantitative variables -direction (positive or negative) -form (linear?) -strength (R value) Question 6: Random sampling Answer: -draw conclusions about populations -reduce bias Question 7: Random assignment Answer: -establish cause and effect -use software to randomly divide treatments -create groups that are a

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STAT 217 Cal Poly Questions with Correct Answers (Grade A+)

Question 1: BIG sample size for errors

Answer: makes TYPE 2 GREATER, no impact on type I

Question 2: Power

Answer: the probability we reject null hypothesis when null is false, we want HIGH probability ex:
probability of committing type 2 is 24%, so power is 76%

Question 3: bigger alpha value

Answer: -easier to reject null -easier to detect when null is false -HIGHER POWER

Question 4: sample size is bigger (power)

Answer: -sample statistics will be close to true value -HIGHER POWER

Question 5: scatterplots

Answer: -2 quantitative variables -direction (positive or negative) -form (linear?) -strength (R value)

Question 6: Random sampling

Answer: -draw conclusions about populations -reduce bias

Question 7: Random assignment

Answer: -establish cause and effect -use software to randomly divide treatments -create groups that are as
similar as possible -reduces CONFOUNDING

Question 8: y=mx+b

Answer: (response variable)=(y-intercept) + (slope) (explanatory variable)

Question 9: R^2

Answer: The % of variation in the response variable that can be accounted for by explanatory variable

Question 10: spread decreases as sample size...

Answer: gets BIGGER




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