ISS (Statistical Services) Statistics Paper I (New 2016 MCQ Pattern): Questions 466 - 467 of 471

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Question number: 466

» Statistical Methods » Non-Parametric Tests » Median

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MCQ▾

Question

Which of the following statements is incorrect for calculation of median for Individual series?

Statement 1: If the number of observations is odd then median is the observation in the arranged order

Statement 2: If the number of observations is even then the median is the mean of and observations in the arranged order.

Choices

Choice (4) Response

a.

Statement 1 and 2 is correct

b.

Only Statement 2 is correct

c.

Statement 1 and 2 is incorrect

d.

Only Statement 1 is correct

Question number: 467

» Statistical Methods » Non-Parametric Tests » Mann-Whitney

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MCQ▾

Question

A physician is interested in the effect of an anesthetic on reaction times. Two groups are compared, one with (A) and one without (B) taking the anesthetic. Subjects had to react on a simple visual stimulus. Reaction times are not normally distributed in this experiment, so data is analyzed with the Mann-Whitney U-Test for ordinal scaled measurements. The table below shows the rank-ordered data:

The table shows the rank-ordered data

The table shows the rank-ordered data

Mean RT

Rank

Group

131

1

B

135

2

A

138

3.5

B

138

3.5

B

139

5

A

141

6

B

142

8

B

142

8

A

142

8

B

143

10

B

144

11

A

145

12

B

156

13

B

158

14

A

165

15

A

167

16

B

171

17

A

178

18

A

191

19

B

230

20

B

244

21

A

245

22

A

256

23

A

267

24

A

268

25

A

289

26

A

The Correct conclusion is

Choices

Choice (4) Response

a.

b.

The anesthetic group shows significantly slower reaction times than the non-anesthetic group

c.

The observed value is greater than the Z-value

d.

All a. , b. and c. are correct