Answer:
The margin of error is 1.76
Step-by-step explanation:
The formula for calculating:
ME= z*

Where:
z= 90%= The level of confidence of the results (also called interval or degree of confidence, generally set at 95% in the survey industry).In this case, it is 1.65
n= sample= 14
σ= standard deviation of $4.
ME= z*

ME= 1.65*

ME=1.65* 1.069
ME=1.76