STA 122

If the slope of the regression line is calculated to be 2.5 and the intercept 16 then the value of Y when X is 4 is:

In study of 100 students that had been awarded Ondo State scholarship, it was found that 40 had part-time jobs,25 had made the Dean’s list the previous semester, and 15 had both apart time job and had made the Dean’s list. What is the probability that a student had a part-time or was on the Dean’s list?

Commonly used statistical methodologies in data analysis include

The variance:

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

The first quartile divides a frequency distribution in the ratio

Which of the following is not an example of a ratio scale variable?

A random variable y has a pdf given below f(y)=k(y²+4) for 0

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

As __________is to population so is _____________sample.

If the probability of producing a defective screw is p=0.01, what is the probability that a lot of 100 screws will contain more than 2 defectives?

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

Tay-Sachs disease is a rare but fatal disease of genetic origin occurring chiefly 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 all the children will have the disease ?

Two events A and B are mutually exclusive if

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

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

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

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

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.

Consider the experiment of drawing 1 card from a deck of 52 cards and observing whether or not the card is a spade. What is the probability of drawing a spade?

Which of the following best characterizes the null hypothesis for chi-square tests?

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?

Sample space is itself an

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.

The following list is a set of data ordered from smallest to largest:2,12,y,y,y,18,18,19.All values are integers and "y" is neither 12 nor 15.

I.The median and the first quartile cannot be equal.
II. The mode is 18
III. The median is 12.

Which of the following statement(s)is/are true about the data set?

Which of the following is a correct use or application of Statistics?

The goal of_____________is to focus on summarizing and explaining a specific set of data.

The variance measures deviation around the :

µ and β are examples of