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 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 If two variables are absolutely independent of each other the correlation between them must be, -1 0 +1 +0.1 Measure of dispersion (or variability)includes the following except standarddeviation variance coefficient of variation mode The measure that deals with the spread of the data is known as measure of Location Dispersion Skewness Data 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 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 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 Which measure of central tendency takes into account the magnitude of score? Mean Median Mode Range The variance: is the square of the standard deviation. can be 0. is never negative. all of the above. Examples of Designs of Experiment are except----------- Completely randomized block design Randomized block design Organized block design Response surface design 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 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 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 Generally, ordinal variables are best displayed visually with: cumulative percentages. collapsed values. pie charts. bar graphs 4.IfN=10,X=12and∑x2=1530.What is the coefficient of Variation? A.+ B C.40 D.2 25 15 40 2 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 For the set of numbers 2,3,5,6,7,7,8 The median is greater than the mode The mean is greater than the mode The mean is greater than the median The mean is less than the median 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 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 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 The_________is often the preferred measure of central tendency if the data are severely skewed Mean Mode Median Range 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 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 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) The expected value of X having binomial distribution with parameters n and p is np n/p p/n 1/(np) If two events are independent, then A. they must be mutually exclusive the sum of their probabilities must be equal to one their intersection must be zero None of the alternative 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 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 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 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 Your score is LinkedIn Facebook Twitter VKontakte Restart quiz Send feedback Like this:Like Loading...