What is the result of subtracting the second equation from the first? \begin{aligned} -2x+y &= 0 -7x+3y &= 2 \end{aligned}
−2x+y
−7x+3y


=0
=2

Now, martin can reasonably guess that the standard deviation for the entire population of people at the mall during the time of the survey is $1.50. what is the 95% confidence interval about the sample mean? interpret what this means in the context of the situation where 95 people were surveyed and the sample mean is $8. use the information in this resource to construct the confidence interval.