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 A probability near 1 indicates an event is Almost certain to occur Not certain to occur Impossible None of the above 2 / 25 Which of the following best characterizes the null hypothesis for chi-square tests? The frequency of people in each category will be a specific proportion The expected frequencies will be significantly lower than obtained frequencies The group means expected at the population level will not reliably differ All of the above 3 / 25 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 4 / 25 How many ways can four children be lined up? 16 4 12 24 5 / 25 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. 14.73 14.25 3.94 4.58 6 / 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) 7 / 25 The General Social Survey asked respondents what region of the country they lived in at age 16.The level of measurement of this variable is: nominal ordinal interval ratio. none of the above. 8 / 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 9 / 25 The following are the basic principles of Design of Experiment except-------------- Randomization Replication Blocking Robustness 10 / 25 Suppose P(A)=0.70, P(B)=0.20 and P(A∩B)=0.15.Find P(A∩B) 0.55 0.75 0.05 0.35 11 / 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 12 / 25 Find the co- efficient of variation of a variable whose mean is 10 and variance is 15% 50% 25% 36% 13 / 25 With the help of histogram we can draw frequency polygon frequency distribution all of the above 14 / 25 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: 2.5 66.5 16 26 15 / 25 The volume of water in commercially supplied fresh drinking water containers is approximately Normally distributed with mean 70 litres and standard deviation 0.75 liters.Estimate the proportion of containers likely to contain .P(X>70.9) 0.251% 0.511 0.111 0.1151 16 / 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 17 / 25 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 18 / 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 19 / 25 An experiment has four equally likely outcomes :E1,E2,E3,andE4.What is the probability that any three of the outcomes occur(e.g.,E1or E2or E4)? 1/24 1/12 1/4 3/4 20 / 25 Probability can be defined as; measure of the likelihood that an event will not occur numerical measure of the likelihood that an event will occur numerical measure of the likelihood that an event will occur None of the above 21 / 25 Sample space is itself an Event Subject Probability Statistics 22 / 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 23 / 25 If two variables are absolutely independent of each other the correlation between them must be, -1 0 +1 +0.1 24 / 25 The expected value of X having binomial distribution with parameters n and p is np n/p p/n 1/(np) 25 / 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 Your score is LinkedIn Facebook Twitter VKontakte Restart quiz Send feedback Like this:Like Loading...
Oladeji Timilehin Daramola
