Answer:
Hence, the confidence interval is
gallons.
Given :
Sample size

Sample mean
gallons
Standard deviation
gallons
So, the standard error

Confidence level

To find :
The
confidence interval for the number of gallons of carbonated beverages consumed per year by Americans.
Explanation :
Confidence interval

Margin error

Here,


from the
table.
So, Margin error



Therefore, the confidence interval is:

gallons.