STA 122 0 votes, 0 avg 150 123456789101112131415161718192021222324252627282930 Created by Oladeji Timilehin Daramola exam - STA 122 NOTE: The quiz is meant for revision purpose only! Join the 100 level group to access other quiz CLICK TO JOIN CLICK An experiment has four equally likely outcomes: E_{1},E_{2},E_{3},andE_{4}.What is the probability that E_{2 }occurs? 1/2 2/4 1/4 1/10 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. 0.2700 0.2572 0.1225 0.6497 Constructing a frequency distribution is one of the most common means of summarizing data. begins by recording the number of times a particular value occurs. is the basis for construction of a percent age distribution. all of the above Given the following set of data:9,8,5,x,6,7.If the arithmetic mean is 6.5,find x. 6 5 4 3 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. 0.9000 0.9800 0.5000 0.9502 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. 1/36 2/36 18/36 1 The_________is often the preferred measure of central tendency if the data are severely skewed Mean Mode Median Range Suppose out of 10 objective questions in STA 122, five are to be answered. How many different sets of questions are possible? 50 30240 1200 24000 Which of the following is a correct use or application of Statistics? Statistics helps in providing a better understanding and exact description of a phenomenon of nature. It helps in proper and efficient planning of a statistical inquiry in any field of study . All of the above. The differences between the upper and lower boundary of class is called____________ Class size Class limit Class interval Class boundary When are events said to be collectively exhaustive ? This is when The compliment of the union of events is the entire sample space The intersection of some of the events is a nullset The union of events is the entire sample space None of the above Measure of dispersion (or variability)includes the following except standarddeviation variance coefficient of variation mode 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. (BG,GGG,BB,GB,BBB,GGB) (BG,GB,BBG,BBB,GGB,GGG) (BG,GB,GGG,BBB) (BG,GB,GGB,BBG) Which of the following is not an example of a ratio scale variable? Age (in days) Speed (in seconds) Height (in inches) Colour of urine 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? 1/3 1/4 0 1/8 A die is rolled and a coin is tossed, find the probability that the die shows an odd number and the coin shows ahead. 1 1/6 1/3 1/4 An experiment has four equally likely outcomes :E_{1},E_{2},E_{3},andE_{4}.What is the probability that any three of the outcomes occur(e.g.,E_{1}or E_{2}or E_{4})? 1/24 1/12 1/4 3/4 Let P(A)=0.60,P(B)=0.45 and P(A∩B)=0.30.FindP(A|B). 0.50 0.667 0.30 0.75 Given the set of data 1,5,6, 10,3 the range and the mean deviation respectively are 9,6 6,10 9,4 9,4.5 A class has 24 students.4 can represent the class at an exam board. How many combinations are possible when choosing this group? 12650 10626 42504 255024 All correlation coefficients share in common the property that they range between +1 and 0 +1.00and-1.00 +0.1and–0.1 +1.96and-1.96 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? The distribution is left skewed. The distribution is right skewed The distribution is symmetric. None of the above. Let X be the number of boreholes a company drill with a mean of 3 borehole per town in Nigeria. What is the probability that the company drill at most one borehole in a randomly selected town? 0.0498 0.4980 0.1992 0.4000 The variance measures deviation around the : mode. median. mean. sum of squares. A random variable X is a discrete random variable if there are a finite number of possible outcomes of X. there area countably infininumber of possible outcomes of X. all of the above none of the above. Suppose P(A)=0.70,P(B)=0.20 and P(A∩B)=0.15.Find P(A∪B) 0.75 0.35 0.85 0.90 Suppose that we have a samples pace S={E1,E2,E3},where E1,E2 and E3 denote the experimental outcomes and the following probability assignments are given for the sample events P(E1)=0.3,P(E2)=0.25,P(E3)=0.45.LetA={E1,E2}.Find P(A). 0.55 0.30 0.75 0.90 Two events A and B are said to be INDEPENDENT if....... P(A|B) =P(A)∙P(B) P(A|B) =P(A∩B) P(A|B) = P(A)+++ P(A|B) =0 Sample space is defined as Set of all experimental outcomes Set of some experimental outcomes Set of one experimental outcomes None of the above 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 ? 0.4 0.04 0.004 0.0004 Your score is LinkedIn Facebook Twitter VKontakte Restart quiz Send feedback Like this:Like Loading...