# Statistical Inference and Hypothesis Testing-Confidence Interval Estimation (ISS Statistics Paper II (New 2016 MCQ Pattern)): Questions 21 - 24 of 73

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## Question number: 21

» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation

MCQ▾

### Question

Confidence Interval (CI) is based on

### Choices

Choice (4) Response

a.

The point estimate or sample mean

b.

Desired level of confidence

c.

Standard error of the point estimate

d.

All a. , b. and c. are correct

## Question number: 22

» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation

MCQ▾

### Question

In a college survey, children were asked how many hours they study per day. A sample of 22 children is collected. The mean was 3.25 hours with a standard deviation of 1.57 hours. Then 95 % confidence interval for the number of hours of study per day is

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 23

» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation

MCQ▾

### Question

A school wants to study the number of days the students will be absent from school per year. It surveys attendance of 10 children and the number of days the children is absent from schools are

 12 13 9 11 7 8 4 9 5 8

Standard deviation Then 99 % Confidence interval on population mean is

### Choices

Choice (4) Response

a.

b.

5.64 ≤ μ ≤ 11.56

c.

Both a. and b. are correct

d.

None of the above

## Question number: 24

» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation

MCQ▾

### Question

A fan manufacturing company needs to know the average amount of time it takes to install a fan. A technique installs it in 64 different houses and the average time of installation is 42 minutes. The calculated standard deviation is 5 minutes. Then 95 % confidence interval foethe mean installation time is

### Choices

Choice (4) Response

a.

b.

c.

42 + 1.225

d.

Both a. and b. are correct

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