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 With the help of histogram we can draw frequency polygon frequency distribution all of the above Statistics is the study of the following: collection or design of data presentation and organization of data All of the above 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 The harmonic mean of five figures is 3.505843, if four of them are 7, 5, 3 and 2, what is the fifth figure (to the nearest whole number)? 4 3 2 5 One of the following is NOT a statistic μ x¯ s s2 The expected value of X having binomial distribution with parameters n and p is np n/p p/n 1/(np) If two variables are absolutely independent of each other the correlation between them must be, -1 0 +1 +0.1 What is the class size of a class whose upper boundary is 10.5 and lower boundary is 4.5? 14 7 5 15 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 One any positive value Zero any value between 0 and 1 Examples of Designs of Experiment are except----------- Completely randomized block design Randomized block design Organized block design Response surface design 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? 0.316 0.114 0.322 0.631 The number of samples of five light-bulbs that can be selected from a lot of 20 bulbs is? 1860480 15504 4845 116280 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. 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 The following are the basic principles of Design of Experiment except-------------- Randomization Replication Blocking Robustness The variance: is the square of the standard deviation. can be 0. is never negative. all of the above. The variance measures deviation around the : mode. median. mean. sum of squares. Commonly used statistical methodologies in data analysis include Descriptive statistics Inferential statistics All of the above As __________is to population so is _____________sample. Statistics; parameters Parameters; statistics Descriptive; inferential Parameter; statistic 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 The following are the measure of dispersion except Range Mean Deviation Harmonic mean Standard Deviation Which of the following is an example of discrete variable? Height Weight Length Number of Oranges 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 µ and β are examples of statistic parameters statistics values None of the above The differences between the upper and lower boundary of class is called____________ Class size Class limit Class interval Class boundary 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 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? 0.002 0.012 0.05 0.009 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 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 Suppose P(A_{1}∩A_{2})=0. Suppose further that P(A_{1})=0.60,P(A_{2})=0.40 ,P(B|A_{1})=0.70 and P(B|A_{2})=0.20.Find P(A_{1}|B). 0.42 0.12 0.28 0.84 Your score is LinkedIn Facebook Twitter VKontakte Restart quiz Send feedback Like this:Like Loading...