h0: Mean difference = 0 ha: Mean difference != 0
p value = ~0
Reject h0
c: 90% (-2.6, -1.3)
Becuase the premium gas costs more, meaning that it may not be cost effective despite better mileage
h0: Mean 1 = Mean 2 ha: Mean 1 != Mean 2
p value > 20%
Cannot reject null
No evidnce to show improvment. means of each group are greater than paired.
Conditions:
Randomly selected, Indepennt as cars are independent, Normal condition as NPP is suitable striaght.
(131.78, 145.61)
We’re 95% confident that the mean amount of pavement needed to stop is between the interval.
(-62.61, -38.78)
We’re 95% confident that thte true increase in stopping distance is between the invertval.
Conditions:
we assume randomly selected, we assume that 10 stops are less than 10% of population, we see that NPP is pretty straight meaning nearly normal model.
(133.6, 145.1)
We’re 95% confident that the mean amount of pavement needed to stop is between the interval.
(-75.5, -50.4)
We’re 95% confident that thte true increase in stopping distance is between the invertval.
Data is paired by college, paired data
Conditions:
Paired, random colleges, we assume less than 10% of colleges. Remove UC Irvine as outlier.
90% confident that nonresidents pay between 2651 and 3918 dollars more than residents without Irvine.
I agree with assertion–3500 is within interval.