(Use Excel) A consumer advocate researches the length of life between two brands
ID: 3271912 • Letter: #
Question
(Use Excel) A consumer advocate researches the length of life between two brands of refrigerators, Brand A and Brand B. He collects data on the longevity of 40 refrigerators for Brand A and repeats the sampling for Brand B. These data are measured in years. Use Table 1.
Specify the competing hypotheses to test whether the average length of life differs between the two brands.
Using the appropriate commands in Excel, find the value of the test statistic. Assume that A2 = 5.0 and B2 = 5.9. What is the p-value? (Negative values should be indicated by a minus sign. Do not round intermediate calculations. Enter "Test statistic" value in 2 decimal places and "p-value" in 4 decimal places.)
(Use Excel) A consumer advocate researches the length of life between two brands of refrigerators, Brand A and Brand B. He collects data on the longevity of 40 refrigerators for Brand A and repeats the sampling for Brand B. These data are measured in years. Use Table 1.
OExplanation / Answer
The statistical software output for this problem is:
Two sample Z hypothesis test:
1 : Mean of Brand A (Std. dev. = 2.236068)
2 : Mean of Brand B (Std. dev. = 2.4289916)
1 - 2 : Difference between two means
H0 : 1 - 2 = 0
HA : 1 - 2 0
Hypothesis test results:
Hence,
a) Hypotheses:
H0 : 1 - 2 = 0
HA : 1 - 2 0
b) Test statistic = -1.25
p - Value = 0.2131
Difference n1 n2 Sample mean Std. err. Z-stat P-value 1 - 2 40 40 -0.65 0.52201533 -1.2451742 0.2131Related Questions
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