Answer:
4.0486
Step-by-step explanation:
The margin of error is calculated using 
Where n=60 is the sample size and 
is the population standard deviation.
The critical value corresponding to 95% confidence interval is 
We substitute the values to obtain;
Slope is found when you put y2-y1/x2-x1. So your equation would be (-2)-2/6-3.
That answer would be -4/3. Nothing can be simplified further, so that is your answer
Four? Isn't it stated in the question? Unless I am assuming wrong.
