STA 122

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

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.

If two events are independent, then A. they must be mutually exclusive

Generally, ordinal variables are best displayed visually with:

A fair die is thrown twice and the two outcomes are added. What is the probability of getting an odd number? Hint: There are 36 outcomes in all.

Gender ,State of Origin ,Religion and Type of diseases are examples of:

If two variables are absolutely independent of each other the correlation between them must be,

With the help of histogram we can draw

Sample space has probability.

Tay-Sachs disease is a rare but fatal disease of genetic origin occurring briefly in infants and children, especially those of eastern European extraction. If a couple are both carriers of Tay Sachs disease, a child of theirs has probability 0.25 of being born with the disease. If such a couple has four children, what is the probability that no child will have the disease?

A probability near 1 indicates an event is

Constructing a frequency distribution

A company receives regular deliveries of raw materials from a supplier. The supplies do not always arrive on time. Over the last 100 delivery days ,supplies have been late on 13 occasions .What is the probability that the supplies will be on time on the next delivery day?

All these are examples of continuous variable except

Which of the following statistics is robust (i mean (i) median (ii)interquatile range (iv) standard deviation (v) Variance

Probability can be defined as;

The following are the basic principles of Design of Experiment except--------------

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

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

These to fall possible values of a random variable X is called

What is the class size of a class whose lower limit is 5 and upper limit is 10?

Suppose the mean of scores obtained by students in a test is 14.If a mean of 217 is obtained when the scores are squared, what is the standard deviation of the scores.

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.

A production department has 35 similar milling machines. The number of breakdowns on each machine averages 0.06 per week. Determine the probabilities of less than three machines breaking down in any week.

What is the class mark of a class whose upper limit is 11.5 and lower limit is 7.2?

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

How many ways can four children be lined up?

How many eras do we have in history of design of experiments?

Which of the following is an example of discrete variable?

If sample mean is 20,population standard deviation is 3 and sample size is 64,find the interval estimate of the mean.