In the long run, of all confidence intervals calculated from the same population will contain the true mean height.

of boys' heights fall with the interval Jim calculated.

There is a chance that Jim's interval contains the true mean height.

of all possible sample means fall within Jim's interval.

More information is needed.

The width of a confidence interval decreases as the sample size increases and increases as the confidence level increases.

The width of a confidence interval increases as the sample size increases and increases as the confidence level increases.

The width of a confidence interval decreases as the sample size increases and increases as the confidence level decreases.

The width of a confidence interval increases as the sample size increases and increases as the confidence level decreases.

The width of a confidence interval does not change as the sample size increases and increases as the confidence level increases.