Can any one help me

hsa

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Mileage tests were performed to compare three different brands of unleaded gas. Four different automobiles were used in the experiment, and each brand of gas was used in each car until the mileage was determined. The results, in miles per gallon, are shown in the table below:
Automobile
Brand
1
2
3
4
A
20.2
18.7
19.7
17.9
B
19.7
19.0
20.3
19.0
C
18.3
18.5
17.9
21.1


  1. Is there evidence of a difference in the mean mileage rating among the three brands of gasoline? Use α = 0.05.
  2. Form an ANOVA table for this experiment.
  3. Is there evidence of a difference in the mean mileage rating for the four models? That is, is blocking important in this type of experiment? Use α = 0.05.
  4. Form a 99% confidence interval for the difference between the mileage ratings of brands B and C.
  5. Form confidence intervals for the three possible differences between the means for the brands, with a simultaneous confidence coefficient of approximately 0.90.
 
Mileage tests were performed to compare three different brands of unleaded gas. Four different automobiles were used in the experiment, and each brand of gas was used in each car until the mileage was determined. The results, in miles per gallon, are shown in the table below:
Automobile
Brand
1
2
3
4
A
20.2
18.7
19.7
17.9
B
19.7
19.0
20.3
19.0
C
18.3
18.5
17.9
21.1


  1. Is there evidence of a difference in the mean mileage rating among the three brands of gasoline? Use α = 0.05.
  2. Form an ANOVA table for this experiment.
  3. Is there evidence of a difference in the mean mileage rating for the four models? That is, is blocking important in this type of experiment? Use α = 0.05.
  4. Form a 99% confidence interval for the difference between the mileage ratings of brands B and C.
  5. Form confidence intervals for the three possible differences between the means for the brands, with a simultaneous confidence coefficient of approximately 0.90.

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