1) A car producer claims a certain type of car is fuel-saving and can be driven 25 miles/gallon and a st dev of 2.8 miles/gallon.
An analyst wants to test this claim and wants a 1% risk of concluding the statement is false when it in fact is true. He chooses 30 observations.
Calculate the...
Just one last question
Since s(y) > s(x)
where x= year 1 and y= year 2
In a)
should I reject H(0) if
s(x)^2 / s(y)^2 < F n(x)-1, n(y)-1, (a)
or reject if
s(x)^2 / s(y)^2 > F n(x)-1, n(y)-1, (a)?
Homework Statement
The electricity usage (KWh) in homes was studied over a period of time.
For Year 1:
Mean = 1130
Std dev. = 196
n = 16
For Year 2:
Mean = 1350
Std dev. = 302
n = 21
a)
Test the hypothesis that the std dev. in year 2 has increased compared to year 1...