Question

Dylan Jones kept careful records of the fuel efficiency of his new car. After the first ten times he filled up the tank, he found the mean was 25.3 miles per gallon (mpg) with a sample standard deviation of 0.8 mpg.

1) Compute the 90% confidence interval for his mpg.
**(Round your answers to 3 decimal places.)**

The confidence interval is between ___ and ___.

2) How many times should he fill his gas tank to obtain a margin
of error below 0.05 mpg? **(Round up your answer to the next
whole number.)**

Sample Size ___

Answer #1

Dylan Jones kept careful records of the fuel efficiency of his
new car. After the first twelve times he filled up the tank, he
found the mean was 26.1 miles per gallon (mpg) with a sample
standard deviation of 1.0 mpg.
Compute the 98% confidence interval for his mpg.
How many times should he fill his gas tank to obtain a margin of
error below 0.15 mpg?

Dylan Jones kept careful records of the fuel efficiency of his
new car. After the first six times he filled up the tank, he found
the mean was 20.5 miles per gallon (mpg) with a sample standard
deviation of 0.6 mpg.
Compute the 90% confidence interval for his mpg. (Use
t Distribution Table.) (Round your answers to 3
decimal places.) Confidence interval for his
mpg________and_______
How many times should he fill his gas tank to obtain a margin
of error...

. Computers in some vehicles calculate various quantities
related to performance. One of these is fuel efficiency, or gas
mileage, usually expresses as miles per gallon (mpg). For one
vehicle equipped in this way, the miles per gallon were recorded
each time the gas tank filled, and the computer was then reset.
Here are the mpg values for a random sample of 20 of these
records:
41.5
50.7
36.6
37.3
34.2
45.0
48.0
43.2
47.7
42.2
43.2
44.6
48.4
46.4...

Computers in some vehicles calculate various quantities related
to performance. One of these is the fuel efficiency, or gas
mileage, usually expressed as miles per gallon (mpg). For one
vehicle equipped in this way, the miles per gallon were recorded
each time the gas tank was filled, and the computer was then reset.
In addition to the computer's calculations of miles per gallon, the
driver also recorded the miles per gallon by dividing the miles
driven by the number of...

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