Exam 2 Review Session

Question 1

interquartile range

Answer 1

the distance between the x values that correspond to Q1 and Q3

Question 2

unbiased statistics

Answer 2

sample statistics in which the average value of the statistic is equal to the population parameter

Question 3

biased statistics

Answer 3

sample statistics in which the average value over or underestimates a population parameter

Question 4

normal curve

Answer 4

1. half of data is above and the other half is below
2. symmetrical around mean
3. total area under the curve is 1

Question 5

probability

Answer 5

the likelihood of obtaining a specific sample from a population; a fraction or proportion of a particular outcome and all the possible outcomes

Question 6

addition rule

Answer 6

p(a or b) = p(a) + p(b) - p(a and b)

Question 7

independent multiplication rule

Answer 7

p(a and b)= p(a)p(b)

Question 8

dependent multiplication rule

Answer 8

p(a and b)= p(a)p(b|a_) * probability of b given a

Question 9

random sampling

Answer 9

when each individual in a population has an equal chance of being selected in a sample

Question 10

sampling error

Answer 10

the discrepancy between a statistic computed from a sample and a population

Question 11

standard error

Answer 11

the average distance between the sample mean and the population mean