Question

1) A manufacturer claims that the mean amount of juice in its 16 ounce bottles is at least 16.1 ounces. C) Two-tailed A) Right-tailed B) Left-tailed 2) A health insurer has determined that the "reasonable and customary" fee for a certain medical procedure is $1200. They suspect that the average fee charged by one particular clinic for this procedure is less than $1200 and wish to conduct a test to see if the suspicion can be supported. B) Left-tailed C) Two-tailed A) Right-tailed 3) In the past, the mean running time for a certain type of flashlight battery has been 8.9 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has changed as a result. B) Left-tailed A) Right-tailed C) Two-tailed True-False 4) The alternative hypothesis determines the tail type. A) True B) False

the pictures are in order so #5 is in included.

Answer 1

1) Correct answer is- A) Right tailed

Since the manufacturer claims that the mean is at least 16.1 ounce , while the actual mean is 16 ounce. So, at least indicates greater than 16.1 ounce. Hence, it is Right-tailed.

2) Correct answer is- B) Left-tailed

Since the insurer suspect that average fees charged by the clinic is less than 1200 dollars.

Hence, it is Left-tailed.

3) Correct answer is- C) Two-tailed

The test is performed to determine whether the mean running time has changed or not. So, he wants to test whether the mean running time is 8.9 hours or not after introducing the change.

4) Correct answer is- A) True

The alternative hypothesis determines the tail type.

Whether the alternative hypothesis is greater, lesser or not equal to the true values, this decides the tail type.

6) Correct answer is- A) True

While performing a hypothesis test on mean, we use Z test if population standard deviation is known.

7) Correct answer is- A)True

While performing hypothesis test on mean, we use t- test if population standard deviation is not known.

8) Correct answer is- A) Ho: Mu<= 34

H1: Mu> 34 Claim R.t.

Here, Mac wants to know if mean age is more than 34 years. Hence, alternative hypothesis is greater that is right tailed.