SCENARIO 9-3
an Appliance Manufacturer Claims to Have Developed a Compact

Multiple Choice

SCENARIO 9-3
An appliance manufacturer claims to have developed a compact microwave oven that consumes a mean of no more than 250 W.From previous studies,it is believed that power consumption for microwave ovens is normally distributed with a population standard deviation of 15 W.A consumer group has decided to try to discover if the claim appears true.They take a sample of 20 microwave ovens and find that they consume a mean of 257.3 W.
-Referring to Scenario 9-3,the appropriate hypotheses to determine if the manufacturer's claim appears reasonable are:

A) H ₀ : $\mu$ = 250 versus H₁ : $\mu$ $\neq$ 250
B) H ₀ : $\mu$ $\ge$ 250 versus H₁ : $\mu$ $\lt$ 250
C) H ₀ : $\mu$$\le$ 250 versus H₁ : $\mu$ $\gt$ 250
D) H ₀ : $\mu$ $\ge$ 257.3 versus H₁ : $\mu$ $\lt$ 257.3