Stat 200 Test 4

Front 1

Are CIs and HTs about variances (or standard deviations) considered risky compared to CIs and HTs about means?

Back 1

yes

Front 2

Back 2

no

Front 3

Are the F distributions symmetric?

Back 3

no

Front 4

Back 4

1

Front 5

What is the area under a F curve?

Back 5

1

Front 6

Back 6

Front 7

When comparing variances, what arithmetic operation is used?

Back 7

division

Front 8

Back 8

F with 9 degrees of freedom on the top and 7 degrees of freedom on the bottom

Front 9

In a continuous distribution the mean is the area under what curve?

Back 9

xp(x)

Front 10

The area under xp(x) gives what value in the continuous case?

Back 10

the mean

Front 11

The area under p(x) gives what value in the continuous case?

Back 11

one

Front 12

Back 12

the variance

Front 13

Back 13

how far a piece of data is from the mean

Front 14

Back 14

on average how far the data is from the mean

Front 15

Is variance an average?

Back 15

yes

Front 16

Variance is the average of what?

Back 16

the squares of how far the data are from the mean

Front 17

Describe what the standard deviation is in words.

Back 17

the square root of the average of the squares of how far the data are from the mean

Front 18

If a set of data is normal with a mean of 40 and a standard deviation of 8, what shape will the data have if each piece of data has 40 subtracted and then that result divided by 8?

Back 18

normal

Front 19

If a set of data is normal with a mean of 40 and a standard deviation of 8, what will be the mean of the data have if each piece of data has 40 subtracted and then that result divided by 8?

Back 19

0

Front 20

If a set of data is normal with a mean of 40 and a standard deviation of 8, what will be the standard deviation of the data have if each piece of data has 40 subtracted and then that result divided by 8?

Back 20

1

Front 21

We came up with the formula for P(A | B) by taking a sports team and making a fraction for P(W | H) and the top of the fraction represented what?

Back 21

how many games were both wins and at home

Front 22

We came up with the formula for P(A | B) by taking a sports team and making a fraction for P(W | H) and the bottom of the fraction represented what?

Back 22

how many games were at home

Front 23

How can you turn “how many” into “probability”?

Back 23

divide by total

Front 24

True or False: P(A and B) and P(A | B) are just two ways to write the same thing?

Back 24

F

Front 25

True of False: P(A | B) is the same as P(B | A)?

Back 25

F

Front 26

Explain what P(A | B) = P(A) means in everyday terms.

Back 26

B has no effect on the chances of A

Front 27

If P(A | B) = P(A) as well as P(B | A) = P(B) we say that A and B have what property?

Back 27

independent

Front 28

If X and Y are independent then P(X | Y) = what?

Back 28

P(X)

Front 29

To figure out how many ways a multi-step process can be done you do what?

Back 29

multiple how many choices at each step

Front 30

How many ways can n things can be arranged in a row?

Back 30

n!

Front 31

When finding out how many ways to pick 6 numbers from 42 numbers in a lottery in which order does not matter we first (incorrectly) came up with what? We realized that each outcome was being counted 6! times? So we divided by this number and came up with the correct answer of (42)(41)(40)(39)(38)(37)/6!

Back 31

(42)(41)(40)(39)(38)(37)

Front 32

When finding out how many ways to pick 6 numbers from 42 numbers in a lottery in which order does not matter we first (incorrectly) came up with (42)(41)(40)(39)(38)(37). We realized that each outcome was being counted how many times? So we divided by this number and came up with the correct answer of (42)(41)(40)(39)(38)(37)/6!

Back 32

6!

Front 33

When finding out how many ways to pick 6 numbers from 42 numbers in a lottery in which order does not matter we first (incorrectly) came up with (42)(41)(40)(39)(38)(37). We realized that each outcome was being counted 6! times. So we divided by this number and came up with the correct answer of what?

Back 33

(42)(41)(40)(39)(38)(37)/6!

Front 34

Back 34

lottery formula

Front 35

Back 35

multiplying in a tree diagram

Front 36

When using the normal to approximate the binomial the probability of exactly 6 successes is approximately the area from _____ to ____, and this is why we add or subtract .5 when using the normal approximation for the binomial.

Back 36

5.5 to 6.5

Front 37

In the binomial setting what does n – k represent?

Back 37

number of failures

Front 38

Back 38

how many ways you can get k successes in n trials

Front 39

In the binomial setting what does np represent?

Back 39

average number of successes

Front 40

In the binomial setting what does nq represent?

Back 40

average number of failures