Stats Midterm #1

Question 1

define a population

Answer 1

any group we’re interested in

Question 2

define a distribution of sampling means

Answer 2

a statistic obtained from repeated sampling of a specific population

Question 3

define a sample

Answer 3

who’s chosen to represent the population

Question 4

how does a distribution of sampling means in relation to a population and sample

Answer 4

a distribution of sampling means relates to a population by representing all possible samples from the population

Question 5

what does NOIR stand for? with examples

Answer 5

NOMINAL (gender, blood type)
ORDINAL (military rank)
INTERVAL (temperature in celcius)
RATIO (weight, age)

Question 6

what percentage of scores falls with -1 and +1 standard deviation

Answer 6

68%

Question 7

what x value corresponds with 95% of all other values

Answer 7

1.96

Question 8

M

Answer 8

sample mean

Question 9

U

Answer 9

population mean

Question 10

when you are given a standard deviation in the question, what kind of test is it?

Answer 10

z-test

Question 11

when you are not given a standard deviation in the question, what kind of test is it?

Answer 11

t-test

Question 12

if the value falls within the tail ends (outside the critical value) of a diagram, we…

Answer 12

we reject the null, therefore there is evidence of an effect

Question 13

if the value falls outside the tails ends (inside the critical values), we…

Answer 13

fail to reject the null, therefore there is no evidence of an effect

Question 14

what alpha value do we use when we don’t care about the type 1 error rate

Answer 14

0.10

Question 15

what alpha value do we use when we have a normal type 1 error rate

Answer 15

0.05

Question 16

what alpha value do we use when we care too much about the type 1 error rate

Answer 16

0.01