(Use Excel) A consumer advocate researches the length of life between two brands

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 = 4.5 and B2 = 6.2. 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.

Explanation / Answer

SolutionA:

H0: 1 2 = 0; HA: 1 2 0

Solution B:

ANSWERS:

z=-1.26

p=0.2088

Solutionc:

p=0.2088

alpha=5%=0.05

p>0.05

Fail to reject Ho

Do not reject H0, there is no evidence that the average life differs between the brands

z-Test: Two Sample for Means Brand A Brand B Mean 18.175 18.825 Known Variance 4.5 6.2 Observations 40 40 Hypothesized Mean Difference 0 z -1.256757436 P(Z<=z) one-tail 0.104420742 z Critical one-tail 1.644853627 P(Z<=z) two-tail 0.208841483 z Critical two-tail 1.959963985

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.