9. Tenaga Nasional Berhad (TNB) has listed a variety of home appliances each with annual total electricity consumption in kilowatt-hours. For a refrigerator, the annual consumption is said to be an average of 46 kilowatt-hours. A random sample of 12 homes included in the study showed that refrigerator consume the electricity at an average 42 kilowatt-hours per year with standard deviation of 1 1.9 kilowatt-hours. By assuming the population is normal, does this sample show that the refrigerator consumes on average less than 46 kilowatt-hours per year?
a) Write the null and alternative hypothesis for this problem.
b) What is the critical value for this test at = 0.05?
c) Calculate the test statistics for this problem. (1 Marks)
(1 Marks)
(2 Marks)
d) Based on the test statistics, what is your conclusion for the problem?
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WHAT IT IS SO LONGGGGGG
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Step-by-step explanation:
H⁰ that medium sized refrigerator consume on the average less than 46 kilowatt-hour per year per
H¹ tht medium sized refrigerator consume on the average more than 46 kilowatt-hour per year
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