A survey research center conducts frequent opinion polls, using large samples drawn by probability methods which are practically free from bias. Each of the last 100 polls was carried to estimate a percentage. All the standard errors were computed by the appropriate technique, and turned out to be very close to 3 percentage points. About how many of the estimates were off by more than 3 percentage points

from the figure we get,

the x axis shows   the months and,

the y-axis shows the number of satisfied customer.

each line or each cell in upward direction (y-axis) shows 500.

the appropriate scale for the y - axis is: -

a = 2000 customers

b = 4000 customers

c = 6000 customers

d = 8000 customers

e = 10000 customers

f = 12000 customers

g = 14000 customers

twenty-six miles over two gallons because the proportion for the original 13 miles to one gallon would be written 13/1 and, doing the same thing to the top and bottom, i multiplied by 2 and got 26/2