The gradient of a line can be calculated using the formula

where

and

are two points that the line passes through
15.23.........????????????
The difference between the price per pound for the three pound bag of oranges and the price per pound for the 5 lb bag of oranges is $0.15
Given
Price of 3lb bag = $3.60
Price of 5lb bag = $5.25
We have to calculate the per pound price for each bag to compare the per pound price for both
Price of one pound in 3lb bag-

Price of one pound in 5lb bag-

Difference between the prices-

The difference between the price per pound for the three pound bag of oranges and the price per pound for the 5 lb bag of oranges is $0.15
Answer: c. Level of Significance
This is the alpha value
alpha is a greek letter with the symbol 
A type 1 error is when the researcher rejects the null, but the null was true (meaning the researcher shouldn't have rejected the null).