bias
prejudice in favor of or against one thing, person, or group compared with another, usually in a way considered to be unfair.
A coin is tossed three times. What is the probability that it lands on heads exactly one time?
0.375
Which of the following statements are true?I. Categorical variables are the same as qualitative variables. II. Categorical variables are the same as quantitative variables. III. Quantitative variables can be continuous variables.
I and III
Hi everyone, I’m ______________________ and I like warm hugs
Olaf, Frozen
Which of the following statements are true?
I. Random sampling is a good way to reduce response bias.
II. To guard against bias from undercoverage, use a convenience sample. III. Increasing the sample size tends to reduce survey bias
IV. To guard against nonresponse bias, use a mail-in survey.
None of the above
Suppose a simple random sample of 150 students is drawn from a population of 3000 college students. Among sampled students, the average IQ score is 115 with a standard deviation of 10. What is the 99% confidence interval for the students' IQ score?
115 + 2.1
An urn contains 6 red marbles and 4 black marbles. Two marbles are drawn with replacement from the urn. What is the probability that both of the marbles are black?
0.16
“____________________ must unlearn what you have learned”
Yoda, The Empire Strikes Back
what is the definition of undercoverage bias
Undercoverage occurs when some members of the population are inadequately represented in the sample.
Suppose we want to estimate the average weight of an adult male in Dekalb County, Georgia. We draw a random sample of 1,000 men from a population of 1,000,000 men and weigh them. We find that the average man in our sample weighs 180 pounds, and the standard deviation of the sample is 30 pounds. What is the 95% confidence interval.
180 +/- 1.86
Bob is a high school basketball player. He is a 70% free throw shooter. That means his probability of making a free throw is 0.70. What is the probability that Bob makes his first free throw on his fifth shot?
0.0057
"I am________________ of Motunui. You will board
my boat and restore the heart to Te Fiti.”
Moana, Moana
Undercoverage,Nonresponse bias,Voluntary response bias
A card is drawn randomly from a deck of ordinary playing cards. You win $10 if the card is a spade or an ace. What is the probability that you will win the game?
4/13
“Yeah, yeah, but your scientists were so preoccupied with whether or not they could, that ____________________didn't stop to think if they should.”
Dr. Ian Malcolm, Jurassic Park
A major metropolitan newspaper selected a simple random sample of 1,600 readers from their list of 100,000 subscribers. They asked whether the paper should increase its coverage of local news. Forty percent of the sample wanted more local news. What is the 99% confidence interval for the proportion of readers who would like more coverage of local news?
0.37 to 0.43
P(A ∪ B) = P(A) + P(B) - P(A ∩ B)
and
P(A ∪ B) = P(A) + P(B) - P(A)P( B | A )
“Three shall be the number _________________ shalt count, And the number of the counting shall be three.”
Brother Renard, Monty Python's Search for the Holy Grail