20. brand were Suppose that two brands of gasoline were being compared for mileage. Samples of each were taken and used in identical cars under identical conditions. Nine tests were made of Brand I and six tests of Brand II. The following miles per gallon were found. Brand Brand II 13 15 16 18 15 23 17 14 19 21 16 17 12 13 Are the two brands significantly different? What must be assumed here in order to carry out h test?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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Author:Carter
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Chapter4: Equations Of Linear Functions
Section4.5: Correlation And Causation
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Hi, please see attached. Having trouble with the calculation of the significance test of this problem. Thanks.

20.
brand were
Suppose that two brands of gasoline were being compared for mileage. Samples of each
were taken and used in identical cars under identical conditions. Nine tests were made of
Brand I and six tests of Brand II. The following miles per gallon were found.
Brand Brand II
13
15
16
18
15
23
17
14
19
21
16
17
12
13
Are the two brands significantly different? What must be assumed here in order to carry out h
test?
Transcribed Image Text:20. brand were Suppose that two brands of gasoline were being compared for mileage. Samples of each were taken and used in identical cars under identical conditions. Nine tests were made of Brand I and six tests of Brand II. The following miles per gallon were found. Brand Brand II 13 15 16 18 15 23 17 14 19 21 16 17 12 13 Are the two brands significantly different? What must be assumed here in order to carry out h test?
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