A research organization wishes to determine whether the driving range of different electric cars on a full charge are equal. The number of mileage for each car is given below.

	Tesla Model S	Ford Mustang Mach-E	Lucid Air
Mean mileage	387	305	520
Sample variance	20	15	30
Sample Size	4	4	4

Use the above data and test to see if the mean mileage for all three brands of electric cars is the same. Let = .05. Complete the ANOVA table and show the details of calculation to get full credits.

a) State the null and alternative hypotheses to be tested.

B)at a 95% confidence, calculate the test statistics (chi-square value) and test the hypotheses (round the first decimal). What are critical values? What is the conclusion?

c) Following the information in Question 1a, develop the 95% interval estimate of the variance for the GRE scores. Please round to the second decimal place