uppose we are about to draw a sample from a normally distributed population, and find a confidence interval for the population mean.  Which one of the following statements is true?   Question 23 options:   If we use a z value when calculating the interval, when we should be using t, the resulting interval will be wider than it should be.   If the sample size is large (n > 30, say), we should always use the z method rather than the t approach.   All else being equal, the larger the sample size the larger the margin of error.   95% of the observations in the sample will fall within the 95% confidence interval we calculate.   A 95% confidence interval will be wider than the corresponding 90% interval calculated on the same data.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Suppose we are about to draw a sample from a normally distributed population, and find a confidence interval for the population mean.  Which one of the following statements is true?

 

Question 23 options:

 

If we use a z value when calculating the interval, when we should be using t, the resulting interval will be wider than it should be.

 

If the sample size is large (n > 30, say), we should always use the z method rather than the t approach.

 

All else being equal, the larger the sample size the larger the margin of error.

 

95% of the observations in the sample will fall within the 95% confidence interval we calculate.

 

A 95% confidence interval will be wider than the corresponding 90% interval calculated on the same data.

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