Final answer:
A larger level of confidence produces a larger t value and a wider interval.
Step-by-step explanation:
A larger level of confidence (the percentage), produces a larger t value and a wider interval.
When we increase the level of confidence, we are capturing more of the probability distribution and allowing for more variability. This means that the t value, which represents the number of standard deviations away from the mean, will be larger. And since the confidence interval is calculated using the t value, a larger t value leads to a wider interval.