Statistical Inference and Hypothesis Testing-Confidence Interval Estimation (ISS (Statistical Services) 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.

Equation

b.

Equation

c.

Equation

d.

Equation

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

Samples from schools and days

What are the readings of the family?

12

13

9

11

7

8

4

9

5

8

Standard deviation Equation Then 99 % Confidence interval on population mean is

Choices

Choice (4) Response

a.

Equation

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.

Equation

b.

Equation

c.

42 + 1.225

d.

Both a. and b. are correct

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