Probability and Statistics 1

Question 1

Formula for interquartile range

Accepted Answer

IQR=Q_3-Q_1

Question 2

The two parameters for the normal distribution

Accepted Answer

mean and variance (or s.d.)

Question 3

If a question says compare measures of central tendency...

Accepted Answer

compare mean, median, mode

Question 4

All probabilities must add to

Accepted Answer

1

Question 5

Formula for the expected value of a discrete probability distribution

Accepted Answer

\sum_{ }^{ }xp

Question 6

You need to remember the z formula! Write it on your formula sheet immediately! Which tho?

Accepted Answer

z=\frac{x-μ}{σ}

Question 7

Given that A and B are independent, to find P(A and B) or P\left(A∩B\right)

Accepted Answer

multiply

Question 8

The only time you use nPr on the test.

Accepted Answer

When the order matters or it says "arrangement."

Question 9

Conditional probability formula for the probability of B given A

Accepted Answer

\left(P\left(B\right|A\right)=\frac{P\left(A∩B\right)}{P\left(A\right)}

Question 10

The geometric distribution is a concept (part of a chapter) we did not cover. Still try to solve, if you have time.

Accepted Answer

True

Question 11

If you would have to calculate a bunch of binomial probabilities or it says using a suitable approximation...

Accepted Answer

approximate the binomial distribution with a normal distribution

Question 12

If you have a z and need probability...

Accepted Answer

do the regular lookup

Question 13

The height of each bar in a histogram is the frequency. You should always label the vertical axis frequency.

Accepted Answer

False

Question 14

The following is the formula for permutations with repeated items\frac{_{_nP_r}}{a!	imes b!	imes c!	imes...}

Accepted Answer

True

Question 15

If you observed value is less than the mean the z will be positive

Accepted Answer

No

Question 16

Given that A and B are mutually exclusive, to find P(A or B) or P\left(A∪B\right)

Accepted Answer

add

Question 17

The height of each bar in a histogram is the frequency density. The formula for frequency density is

Accepted Answer

f.d.=\frac{frequency}{class.width}

Question 18

You will forget to make a key for your stem-and-leaf representation of data

Accepted Answer

False

Question 19

In a normal distribution, if you are given a probability...

Accepted Answer

do the reverse lookup

Question 20

You should use pencil and a ruler for any graphs.

Accepted Answer

Always

Question 21

You will need to use the standardization formula in almost every normal distribution problem.

Accepted Answer

Yes

Question 22

What is the test to determine if A and B are independent?

Accepted Answer

if and only if P\left(A∩Bight)=P\left(Aight)	imes P\left(Bight)

Question 23

You should skim all the questions on the test before starting, and make a plan of how to complete it most efficiently.

Accepted Answer

True

Question 24

Classes need to touch for continuous data representations such as

Accepted Answer

histograms and cumulative frequency graphs

Question 25

You know you have a binomial if there are

Accepted Answer

fixed number of trials, constand prob, two outcomes, indpendent events

Question 26

Two parameters for a binomial distribution

Accepted Answer

number of trials, probability of success

Question 27

A probability distribution table is

Accepted Answer

a table values and their associated probabilities

Question 28

To calculate s.d. from grouped datas.d.=\sqrt{\frac{\sum_{ }^{ }x^2f}{\sum_{ }^{ }f}-\left(\overline{x}\right)^2}

Accepted Answer

where x is the mid-class value

Probability and Statistics 1

Questions 28

Probability and Statistics 1

Questions 28