True or false: a race car driver tested his car for time from 0 to 60 mph, and in 20 tests obtained an average of 4.85 seconds with a standard deviation of 1.47 seconds. a 95% confidence interval for the 0 to 60 time is 4.52 seconds to 5.18 seconds.

False

Step-by-step explanation:

given that a race car driver tested his car for time from 0 to 60 mph, and in 20 tests obtained an average of 4.85 seconds with a standard deviation of 1.47 seconds.

Sample size n = 20

since population standard deviation is not known, we can use t critical value for finding out the confidence interval

df=19

t critical = 2.045

Margin of error =

conidence interval = Mean±Margin of error

=

The given confidence interval is (4.52, 5.18)

Hence the statement is false.

you never say the total so we cant find the percentage used for petrol

step-by-step explanation:

180

step-by-step explanation: