ECAT Pre General Science Statistics Online Test With Answers

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ECAT Pre General Science Statistics Online Test

Sr. # Questions Answers Choice
1 In the study of two attributes, n = B +<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">α</span> (AB) + (AB) AB + (<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">αB)</span> (A) + (<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">α)</span>
2 The frequency of classes of the highest order are called Consistence of frequencies Ultimate class frequencies Independence of attributes None of these
3 If no attributes are specified, then the order of the class is 0 1 n None of these
4 The Classes Aβ,αB, etc. are called

 Positive classes Negative classes Negative of A and B Contrary classes
5 The two attributes A and B are independent, if the co-efficient of association Equals to one Equals to zero Not equals to zero None of these
6 The degree of relationship between the two attributes is called Association Dichotomy Variable None of these
7 The attributes denoted by A, B, ................ are called Positive attributes Negative attributes Contingency attributes None of these
8 If A denote that the object possesses the attribute A, thenα, means <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">β</span> Not<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">β</span> Not<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: small;">α</span> Not A
9 The Greek lettersα ,β ....... are used to denote the ________ of A,B,C ............ Presence Inverse Absence None of these
10 The process of dividing the objects into two mutually exclusive classes is called Variable Population Dichotomy Frequency distribution
11 The purpose of simple linear regression analysis is to Replace points on a scatter diagram by a straight line Measure the degree to which two variables are linearly associated Predict one variable from another vaiable None of these
12 If r between the lines of regressions of x and y and y on x, is +1, then Lines coincides Lines are perpendicular There is perfect correlation between x and y A, B and C
13 If the two regression coefficients are 0.8 and 0.2, then coefficient of correlation r is 0.4 -0.4 1.6 None of these
14 If r = 1 or -1, the regression lines are Parallel Inclined at the angle &lt; Perpendicular None of these
15 If the sum of the product of deviations of x and y series from their means is zero, the correlation coefficient will be 1 -1 0 None of these
16 If x and y are independent variables, then two lines of regression are x= 0, y = 0 x = 0, y = const x = const, y = 0 x= const, y = const
17 If the correlation coefficient r = 0, the two regression lines are Parallel Perpendicular Coincident Inclined at 45<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>to each other
18 The two regression lines are perpendicular to each other if r = 1 r = 0 r = -1 None of these
19 If the critical region is located equally in both tails of the sampling distribution of test statistic, the test is called a Two tailed test One tailed test Right tailed test Left tailed test
20 For a two tailed test of hypothesis at alpha = 0.10, the acceptance region is the entire region To the right of the critical value Between the two critical values Outside of the two critical values To the left of the positive critical value
21 For a particular test, alpha = 0.05 and beta = 0.10. The power of this test is 0.15 0.90 0.85 0.95
22 Rejecting a null hypothesis, when it is true, is called Row scale Simple hypothesis Type 1 error Type 2 error
23 The probability of a type 1 error is Alpha beta Power curve None of these
24 The null hypothesis always refers to a specified value of the Population parameter Statistic Sample statistic None of these
25 The null hypothesis (Ho) is the hypothesis that is always rejected accepted zero tested
26 The statement of the alternative hypothesis never contains a(n) ________ sign regarding the specified value of the parameter equal greater than less than None of these
27 A null hypothesis is always one of status quo or effected having some difference having alternative no difference
28 _________ is the maximum variance unbiased estimator of the population variance Estimator Statistic Sample mean All of these
29 Which of the following is/are unbiased estimators Sample mean Sample proportion Sample variance All of these
30 When choosing an estimator of a population parameter, one should consider Sufficiently Efficiency Option A &amp; B None of these
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