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
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 | |
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| b. |
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| c. | 42 + 1.225 |
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| d. | Both a. and b. are correct |
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Question number: 25
» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation
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
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Question number: 26
» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation
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
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| Choice (4) | Response | |
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| a. |
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| b. |
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| c. |
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