STAT 122/224 0% 0 Created by Oladeji Timilehin Daramola STA 122/224 NOTE: The quiz is meant for revision purpose only! Join the 100 level group to access other quiz CLICK TO JOIN Join the 200 level group to access other quiz CLICK TO JOIN 1 / 25 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? 0.40 0.25 0.10 0.50 2 / 25 A probability near 1 indicates an event is Almost certain to occur Not certain to occur Impossible None of the above 3 / 25 What is the class size of a class whose upper boundary is 10.5 and lower boundary is 4.5? 14 7 5 15 4 / 25 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 5 / 25 A mode: can be found only for discrete variables. is the value of the most frequently occurring score is usually less for ordinal than for interval/ratio variables. is usually less than the mean. 6 / 25 The expected value of X having binomial distribution with parameters n and p is np n/p p/n 1/(np) 7 / 25 What is the class mark of a class whose upper limit is 11.5 and lower limit is 7.2? 18.7 9.35 4.3 -3.4 8 / 25 With the help of histogram we can draw frequency polygon frequency distribution all of the above 9 / 25 Examples of Designs of Experiment are except----------- Completely randomized block design Randomized block design Organized block design Response surface design 10 / 25 Two events A and B are mutually exclusive if P(A∩B)=1 P(A∪B)=P(A) P(A∩B)=P(A) P(A∩B)=0 11 / 25 Generally, ordinal variables are best displayed visually with: cumulative percentages. collapsed values. pie charts. bar graphs 12 / 25 A random variable y has a pdf given below f(y)=k(y^{2}+4) for 0 3/13 3/12 7/13 7/12 13 / 25 The variance: is the square of the standard deviation. can be 0. is never negative. all of the above. 14 / 25 If two variables are absolutely independent of each other the correlation between them must be, -1 0 +1 +0.1 15 / 25 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 16 / 25 If the largest value of a data set is doubled ,which of the following is false? The mean increases. The standard deviation increases The inter-quartile range increases The median remains unchanged 17 / 25 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 18 / 25 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 19 / 25 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 20 / 25 These to fall possible values of a random variable X is called Values of X Support of X Random support of X Density of X 21 / 25 The number of samples of five light-bulbs that can be selected from a lot of 20 bulbs is? 1860480 15504 4845 116280 22 / 25 A fair coin is flip twice .The outcomes are {HH,HT,TH,TT}. Each has the same probability . Which of the following options satisfies that the event H1 (where the first flip comes up heads) is independent from the event H2 (where the second flip comes up heads). (H1ᴜH2) P(H1∩H2) P(H1∩H2) P(H1) =P(H2) 23 / 25 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 24 / 25 Suppose two events E and F with non-zero probabilities are mutually exclusive. Then E and F are independent E and F are dependent All of the above D.None of the above 25 / 25 The variance measures deviation around the : mode. median. mean. sum of squares. Your score is LinkedIn Facebook Twitter VKontakte Restart quiz Send feedback Like this:Like Loading...