Stats 9 10 11

Question 1

Confidence Interval and hypothesis test refer to

Answer 1

the population

Question 2

Precision

Answer 2

describes how much variability there is from one sample mean to the next

Question 3

more precision

Answer 3

population standard deviation is small

sample size is large

Question 4

standard error

Answer 4

square root standard deviation over population size

Question 5

Central Limit Theorem

Answer 5

if the conditions are met and the population mean and standard deviation then the sampling distribution will be approximately normal

Question 6

Z-test statistic

Answer 6

categorical data
random sample
at least 10 successes and 10 fails

Question 7

t-test statistic

Answer 7

quantitative data
random sample
nearly normal
matched pairs or independent groups

Question 8

Chi-square test

Answer 8

categorical data one column or spread sheet
random sample
all expected values greater than or equal to 5

Question 9

ANOVA

Answer 9

3 or more data sets all measuring the same quantitative variable
random sample 
data sets are independent
nearly normal
variances are close

Question 10

reject the null

Answer 10

there is significant evidence

p-value is less than significance level

Question 11

fail to reject the null

Answer 11

there is not significant evidence

p-value is greater than the significance level

Question 12

CI

Answer 12

the confidence level is a measure of how well the method used to produce the confidence interval performs

Question 13

dependent

Answer 13

each observation from one group is coupled with a particular observation from the other group

Question 14

independent

Answer 14

there is no pairing