# ISS (Statistical Services) Statistics Paper I (New 2016 MCQ Pattern): Questions 425 - 428 of 471

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## Question number: 425

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MCQ▾

### Question

Let the random variable where and ∑= and . Then which of the following statement is correct regarding the value of?

### Choices

Choice (4) Response

a.

is a matrix.

b.

is a matrix.

c.

is a matrix.

d.

Question does not provide sufficient data or is vague

## Question number: 426

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MCQ▾

### Question

The value of , chi square statistic of the given data set is ________.

### Choices

Choice (4) Response

a.

b.

c.

9.375

d.

None of the above

## Question number: 427

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MCQ▾

### Question

Which of the following statement is/are not correct?

### Choices

Choice (4) Response

a.

A frequency polygon is a closed figure that is formed by joining the top midpoints of all the rectangles of a histogram using a free hand.

b.

A frequency curve is a closed figure that is formed by joining the top midpoints of all the rectangles of a histogram using straight line.

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

## Question number: 428

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MCQ▾

### Question

What is the correlation between the following z-scores?

 X Y 0.1 0.2 0.6 0.4 -0.3 -1.0 -0.5 -0.3 0.8 0.7

### Choices

Choice (4) Response

a.

b.

0.425

c.

d.

Question does not provide sufficient data or is vague