Question

le herd of cows?
9
26 A few engineering students decide to see whether cars that supposedly do not need high speed
petrol get more running per litre using regular or high speed petrol. They test several cars
under similar road surface, weather, and other driving conditions), using both types of petrol
in each car independently at different times. The distance travelled (km) for each petrol type
for each car is as follows:
CAR
PETROL 1 2 3 4 5 6
7 8
10
TYPE
Regular 15 18 21 17 22 17 19 22. 19 19
High speed 18 21 25 24 25 25 21
27 24 20
Is there any evidence of a difference in the average mileage between regular and high-speed
petrol? (Use a = 0.05.) Construct the confidence interval at 5% level of significance? (b) Do
you think any of the assumptions needed in (a) have been violated?
​

Answer 1

Answer:

le herd of cows?

9

26 A few engineering students decide to see whether cars that supposedly do not need high speed

petrol get more running per litre using regular or high speed petrol. They test several cars

under similar road surface, weather, and other driving conditions), using both types of petrol

in each car independently at different times. The distance travelled (km) for each petrol type

for each car is as follows:

CAR

PETROL 1 2 3 4 5 6

7 8

10

TYPE

Regular 15 18 21 17 22 17 19 22. 19 19

High speed 18 21 25 24 25 25 21

27 24 20

Is there any evidence of a difference in the average mileage between regular and high-speed

petrol? (Use a = 0.05.) Construct the confidence interval at 5% level of significance? (b) Do

you think any of the assumptions needed in (a) have been violated?

Answer 2

Answer:

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