# Statistical Inference and Hypothesis Testing-Confidence Interval Estimation (ISS (Statistical Services) Statistics Paper II (New 2016 MCQ Pattern)): Questions 19 - 23 of 73

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## Question number: 19

» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation

MCQ▾

### Question

A car manufacturing company wants to estimate the mean amount of time a worker takes to assemble the tyres. He considers a sample of 120 workers and calculated mean is 16.2 minutes. Suppose the population standard deviation is 3.6 minutes then 92 % confidence interval is given by:

### Choices

Choice (4) Response

a.

b.

c.

Question does not provide sufficient data or is vague

d.

None of the above

## Question number: 20

» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation

MCQ▾

### Question

It is given that sample mean is 127.3, standard deviation is 19 and sample size is 3534. Then the 95 % confidence Interval is

### Choices

Choice (4) Response

a.

b.

c.

d.

## 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

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