Question

3 point: QUESTION 11 In 1995, the mean duration of long-distance telephone calls originating in one town was 6.5 minutes. A long- distance telephone company wants to perform a hypothesis test to determine whether the mcan duration of long-distance phone calls has changed from 1995. Determine the null and alternative hypotheses. Ho:u=6.5 vs Ha:#6.5 OH 0 = 6.5 vs Ha H< 6.5 OHO:<6.5 vs Hall> 6.5 OHO: 6.5 vs Hau - 6.5 QUESTION 12 3 points A sample of 50 chewable vitamin tablets have a sample mean of 230 milligrams of vitamin C. Nutritionists want to perform a hypothesis test to determine how strong the evidence is that the mean mass of vitamin C per tablet exceeds 225 milligrams. State the appropriate null and alternative hypotheses. HOMS 225 vs H :x> 225 HOM= 225 vs H : ## 225 HORS 230 vs H :> 230 Mo:# < 230 vs H :x>230 Click Save and Suhait to serve and submit. Click Save All Answers to see all ansur.

Answer 1

Solution:

Question 11)

Claim : Mean exceeds 225 ?

So , hypothesis are

H₀ : $\mu$ = 6.5 vs H_a : $\mu$ $\neq$ 6.5

Question 12)

Claim : Is mean changed ?

So , hypothesis are

H₀ : $\mu$ $\leq$   225 vs H₁ : $\mu$ >   225