FORESTRY
AGRICULTURAL STATISTICS AND ECONOMICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Yes
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No
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Not enough information.
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None of the above
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Detailed explanation-1: -A 95% confidence interval is a range of values that you can be 95% certain contains the true mean of the population. This is not the same as a range that contains 95% of the values. The graph below emphasizes this distinction.
Detailed explanation-2: -What exactly is a confidence interval? A confidence interval is the mean of your estimate plus and minus the variation in that estimate. This is the range of values you expect your estimate to fall between if you redo your test, within a certain level of confidence.
Detailed explanation-3: -Note that for a given sample, the 99% confidence interval would be wider than the 95% confidence interval, because it allows one to be more confident that the unknown population parameter is contained within the interval.
Detailed explanation-4: -The general form for a confidence interval for a single population mean, known standard deviation, normal distribution is given by X ¯ − Z ( n ) ≤ ≤ X ¯ + Z ( n ) X ¯ − Z ( n ) ≤ ≤ X ¯ + Z ( n ) This formula is used when the population standard deviation is known.