251. Which of the following describe the middle part of a group of numbers ?
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A. Measure of Variability

B. Measure of Central Tendency

C. Measure of Shape

D. Measure of Association

252. The basic random numbers are ________________?
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A. None of these

B. 0 and 1

C. 0,1,2,9

D. 1,2,3.10

253. ?xy is always equal to_____________?
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A. ?o2

B. ?x

C. ?yx

D. #NAME?

254. Var (kY)= ____________?
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A. k2 Var(Y)

B. k Var (Y)

C. k2

D. Var(Y)

255. To cut a population into three classes is called_______________?
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A. Capital

B. Tracheotomy

C. Attribute

D. Dichotomy

256. The measure of Dispersion can never be________________?
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A. 1

B. 0

C. Negative

D. Positive

257. If the third moment about mean is zero then distribution is_______________?
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A. Mesokurtic

B. Negatively Skewed

C. Symmetrical

D. Positively Skewed

258. Which of the following cannot be less than zero (negative)?
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A. Median

B. Mode

C. Harmonic Mean

D. Geometric Mean

E. Arithmetic Mean

259. Standard deviation of the sampling distribution of a statistics is called_____________?
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A. Dispersion

B. Difference

C. Serious error

D. Standard error
260. If bxy = byx = r then ________________?
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A. 6y < 6x

B. 6x = 6y

C. 6x < 6y

D. Non of These

261. If bxy = -.8 by x = 1.2 then value of r is ________________?
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A. ?-.96

B. ?.96

C. 0

D. None of these
262. Suppose for 40 observations, the variance is 50. If all the observations are increased by 20, the variance of these increased observation will be______________?
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A. 70

B. 50

C. 50/20

D. 50-20 = 30

E. 50

263. A model is linear if it is linear in the dependent variable and also in ______________?
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A. Non of these

B. Error term

C. Independent variable

D. Parameter
264. If a card is chosen from a standard deck of cards, what is the probability of getting a five or a seven ?
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A. 1/169

B. 8/52

C. Apr-52

D. 26-Jan

265. The probability of an event cannot be _____________?
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A. Zero

B. Negative

C. None of these

D. Positive

266. E(ax + b) = A E(x) +___________________?
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A. b

B. b E(a)

C. (C)

D. E(x)
267. Two event are said to be equally likely is ______________?
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A. As any other

B. both event occurs

C. One occurs

D. not both occurs

268. A discrete probability distribution may be represented by____________?
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A. All of these

B. A Table

C. A Graph

D. A mathematical Equation

269. Population census is conducted through_______________?
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A. Accounting

B. Sample survey

C. Complete enumeration

D. Investigation

270. Which one of the following measurement does not divide a set of observations into equal parts ?
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A. Deciles

B. Standard Deviations

C. Median

D. Percentiles

E. Quartiles

271. Which of the following is not based on all the observations ?
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A. Weighted Mean

B. Harmonic Mean

C. Arithmetic Mean

D. Mode

E. Geometric Mean

272. Var(2X+3) is________________?
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A. 4 Var(X)+3

B. 5 Var(X)

C. 5 Var(X)+3

D. 4 Var(X)
273. If x = 3 then value of regression co-efficient of X or Y is ________________?
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A. (0)

B. -4

C. -3

D. -3

274. If in a sampling distribution of X the sample size is 25, what assumption must hold for the sampling distribution of X to be normal ?
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A. ?x = ?x /?n

B. Population distribution is uniform

C. Population distribution is normal

D. ?1 = ?x

275. In w.o.r 2?x=_____________________?
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A. ?/?n?N n/N 1

B. 26/?n N n/N 1

C. 26/?n?N n/N 1

D. 26/?n

276. Two attributes are associated if expected frequency is ____________________?
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A. Equal to observed

B. Greater than observed

C. Less than observed

D. None of these

277. Which of these represent qualitative data______________?
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A. Liking or disliking of (500) persons of a product

B. Income of a government servant in a city

C. Yield from a wheat plot

D. Height of a student

278. A listing of the possible outcomes of an experiment and their corresponding probability is called:______________?
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A. Contingency table

B. Bayesian table

C. Probability distribution

D. Random Variable

E. Frequency distribution

279. If x and y are Independent to each other the coefficient of correlation is _____________?
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A. -1

B. 0.6

C. 1

D. 0
280. Regression co-efficient is denoted by_____________?
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A. by

B. m

C. bzx

D. byx
281. The mean of a distribution is 23, the median is 24, and the mode is 25.5. It is most likely that this distribution is_____________?
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A. Asymptotic

B. Symmetrical

C. Positively Skewed

D. Negatively Skewed
282. The difference between statistics and parameter is called:______________?
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A. Bias

B. Standard

C. Sampling error

D. both (a) and (b)

283. The probability of even/odd numbers when a fair die is rolled is____________?
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A. 6-Feb

B. Jan-36

C. 3/6

D. 6-Jan

284. Random numbers are used for selection of ____________?
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A. Random space

B. Space

C. Non of these

D. Random sample

285. A characteristics that does not change is called______________?
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A. Constant

B. Attribute

C. variable

D. None of these

286. The mean of a constant b is_________________?
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A. Zero

B. b

C. None

287. For Mesokurtic curve of the distribution, ?2 is__________________?
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A. None of these

B. 3

C. 3

D. Zero

288. Results obtained by counting are_____________?
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A. Continuous

B. Discrete

C. Both (a) and (b)

D. None of these

289. The average of first n natural numbers is_______________?
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A. n2

B. None of these

C. n+12

D. All of the above

290. What is the probability that a ball drawn at random from a jar ?
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A. Cannot be determined from given information

B. 0.1

C. 1

D. 0

E. 0.5

291. For a certain distribution if ?(x?2)=18,?(x?24)=0,?(x?28)=?24) then arithmetic mean is_______________?
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A. 0

B. 28

C. 21

D. 24
292. The probability of drawing an even number in a toss of a balanced die ______________?
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A. 3/6

B. 6-Jun

C. 6-Feb

D. 6-Jan

293. If a distribution has two modes then this distribution is called______________?
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A. Bi-Modal

B. None of these

C. Multi-Modal

D. Uni-Modal

E. Tri-Modal

294. Given the N values in a series, the geometric mean is______________?
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A. The Nth root of the product of N values

B. The square root of the product of N values

C. The fourth root of the product of N values

D. The third root of the product of N values

295. The possibility of total outcome in a coin equal to _______________?
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A. Fifty %

B. 60%

C. Twenty %

D. 30%

296. The distribution function F(X) is represent by_______________?
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A. P(X=x)

B. P(X>x)

C. P(X?x)

D. P(X

297. The standard deviation of sampling distribution of a statistics is _________________?
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A. Sampling distribution of statistics

B. None of these

C. Standard error of statistics

D. Sampling error of statistics

298. When X denotes the number of success in binomial experiment, it is called ________________?
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A. Random variable

B. Binomial random variable

C. Continuous random variable

D. Both (b) and (c) but not (a)

299. Variance remains unchanged by change of_____________?
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A. None of these

B. Scale

C. Both

D. Origin
300. The measure of relative dispersion is called __________________?
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A. Mean dervation

B. Coefficient of quartile Deviation

C. Quartile deviation

D. Mean coefficient