Step 1 :A student was asked to find a $98 \%$ confidence interval for widget width using data from a random sample of size $n=15$.
Step 2 :The interval given is $13.1<\mu<20.5$.
Step 3 :The correct interpretations are: 'With $98 \%$ confidence, the mean width of all widgets is between 13.1 and 20.5' and 'There is a $98 \%$ chance that the mean of the population is between 13.1 and 20.5'.
Step 4 :\(\boxed{\text{'With $98 \%$ confidence, the mean width of all widgets is between 13.1 and 20.5'}}\)
Step 5 :\(\boxed{\text{'There is a $98 \%$ chance that the mean of the population is between 13.1 and 20.5'}}\)