# ISS (Statistical Services) Statistics Paper I (New 2016 MCQ Pattern): Questions 466 - 467 of 472

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## Question 466

### Question

MCQ▾

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 467

### Question

MCQ▾

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:

 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