STA 122

Let P(A)=0.60,P(B)=0.45 and P(A∩B)=0.30.FindP(A|B).

µ and β are examples of

The General Social Survey asked respondents what region of the country they lived in at age 16.The level of measurement of this variable is:

Generally, ordinal variables are best displayed visually with:

A probability near 1 indicates an event is

An experiment has four equally likely outcomes :E₁,E₂,E₃,andE₄.What is the probability that any three of the outcomes occur(e.g.,E₁or E₂or E₄)?

A random variable X is a discrete random variable if

A class has 24 students.4 can represent the class at an exam board. How many combinations are possible when choosing this group?

Given the set of data 1,5,6, 10,3 the range and the mean deviation respectively are

There are two car factories, A and B. Each year ,factory A produces 1000 cars ,of which 10 are lemons. Factory B produces 2 cars, which are lemons. All cars go to a single lot ,where they are thoroughly mixed up. I buy a   is the probability it came from factory B?

Probability can be defined as;

Suppose P(A₁) = 0.6 and P(A₂ )=0.4.If P(A₁∩A₂)=0,are A₁ and A₂ independent events?

Suppose P(A)=0.70, P(B)=0.20 and P(A∩B)=0.15.Find P(A∩B)

The expected value of X having binomial distribution with parameters n and p is

One of the following is NOT a measure under categorical variable

The_________is often the preferred measure of central tendency if the data are severely skewed

There are two car factories, A and B .Each year ,factory A produces 1000 cars, of which 10 are lemons. Factory B produces 2 cars, which are lemons .All cars go to a single lot, where they are thoroughly mixed up. I buy a car .What is the probability that it is a lemon?

An experiment has four equally likely outcomes: E₁,E₂,E₃,andE₄.What is the probability that E₂ occurs?

Suppose two events E and F with non-zero probabilities are mutually exclusive. Then

Let X be the number of borehole a company drill with a mean of 3 borehole per town in Nigeria .What is the probability that the company drill at least one borehole in a randomly selected town.

A statistician collected data on In come per person 200 individuals. He has a mean of 12482.3 and median 6975.14.Which of these is likely to be true?

For the set of numbers 2,3,5,6,7,7,8

The first quartile divides a frequency distribution in the ratio

Examples of Designs of Experiment are except-----------

A couple decides to have children until either (i)they have both a boy and a girl or (ii)they have three children .What is the set of outcomes? Write B for boy ,G for girl ,and write them in birth order.

Suppose that 24% of companies in a certain sector of the economy have announced plans to expand in the next year (and the other 76% will not) .In a sample of twenty companies chosen at random drawn from this population ,find the probability that the number of companies which have announced plans to expand in the next year will be precisely five.

The number of samples of five light-bulbs that can be selected from a lot of 20 bulbs is?

The_________is often the preferred measure of central tendency if the data are severely
skewed

Suppose P(A₁∩A₂)=0. Suppose further that  P(A₁)=0.60,P(A₂)=0.40 ,P(B|A₁)=0.70 and P(B|A₂)=0.20.Find P(A₁|B).

Two events ,A and B are mutually exclusive and each have a non zero probability .If event A is known to occur ,the probability of the occurrence of event B is