Final answer:
The upper limit of an 88% confidence interval for the given data falls between 68.82 and 68.98, but a precise number can't be determined without additional tools or statistical tables.
Step-by-step explanation:
The student is asking for the upper limit of a confidence interval for a given set of statistical data. To find this, we use the mean (μ), the standard deviation (σ), the sample size (n), and the confidence level of the interval. Since the exact Z-score or t-value corresponding to an 88% confidence level is not typically provided in standard tables, we would either use software or interpolate between the known Z-scores for the common confidence levels that are closer, such as 90% or 95%.
Given the information that the 90% confidence interval is (67.18, 68.82) and the 95% confidence interval is (67.02, 68.98), we can deduce that the upper limit of an 88% confidence interval would fall somewhere between 68.82 and 68.98. However, with the data provided, a precise number for the 88% confidence interval upper limit cannot be calculated without additional statistical tools or tables.