# Statistical Inference and Hypothesis Testing-Confidence Interval Estimation (ISS (Statistical Services) Statistics Paper II (New 2016 MCQ Pattern)): Questions 24 - 26 of 73

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## 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

## Question number: 25

» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation

MCQ▾

### Question

The Indian Government wants the information of children per family. It takes a random sample of 40 families and the numbers of children in the selected families are

 1 2 1 2 1 1 1 1 5 4 3 4 1 0 1 2 1 0 3 0 0 0 2 2 5 3 1 0 8 1 0 1 2 1 1 5 2 1 2 3

Calculated standard deviation is σ = 1.95. Obtain the 90 % confidence interval for the mean number of children per family in India

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 26

» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation

MCQ▾

### Question

The health organization wants to study the mean weight of Indian women of the age group 30 - 40. A sample of forty woman of that age group is randomly selected and their weights in pounds are recorded.

 140 153 167 115 136 136 145 125 147 134 154 148 136 126 139 132 152 132 139 120 130 138 138 146 116 137 143 115 159 147 122 145 128 123 134 127 131 154 150 116

The calculated standard deviation is σ = 12.77. Then the 99 % confidence interval for the mean weight is

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page