Unit 7

Question 1

Parameter

Answer 1

that describes POPULATION, uses Greek letters (mew, sigma, p)

Question 2

Statistic

Answer 2

computed from SAMPLE. Observed, known, used to estimate parameter, uses English letters (x-bar, s, p-hat)B

Question 3

Bias

Answer 3

Mean

Difference between center of sampling distribution and “true center” of parameter

x-bar - mew
–> randomize

Question 4

Variability

Answer 4

SD

Spread of sampling distribution
Larger distribution –> smaller spread
Further when sample gets larger

s - sigma
–> large sample

Question 5

Mean

Answer 5

Quantitative

Question 6

Proportion

Answer 6

Categorical, %, cannot exceed 1

Question 7

Mean (CLT)

Answer 7

SHAPE: Normal if n>30
CENTER: mew of sample=mew, avg of the sample mean is the true mean
SPREAD: formula sheet

QUANTITATIVE

Question 8

Proportion (CLT)

Answer 8

SHAPE: np>10, n(1-p)>10
CENTER: SD of sample=SD, avg of the sample proportions is the true proportion
SPREAD: formula sheet

CATEGORICAL

Question 9

CLT Conditions

Answer 9

INDEPENDENT: –> math: N>10n
–> words: sample (n) must be less than 10% of your population (N)
–> random: usually stated

If something is not met, write “If ____ was met”