(This is a multiple choice question with possibly more than 1 choices.) If, afte

Question

(This is a multiple choice question with possibly more than 1 choices.)

If, after you obtain the 95% confidence interval, you find it to be too wide, which of the following remedial steps can you take to reduce the width of the confidence interval? Please choose best option more than one answer is possible.

To re-do the 95% confidence interval with only half of the sample data

To re-do the 95% confidence interval with more sample data

Provided that the population standard deviation has been increased.

Provided that the population standard deviation has been decreased

To construct a 99% confidence interval instead of a 95% one

To construct a 90% confidence interval instead of a 95% one

Explanation / Answer

If, after you obtain the 95% confidence interval, you find it to be too wide

a) To construct a 99% confidence interval instead of a 95% one

since at 99%, z critical value is 2.58

b) Provided that the population standard deviation has been decreased

standard deviation and confidence interval width is always reciprocal

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