For healthy adults, the mean pH level is \mu=7.4, a new drug for

Joseph Krupa

Joseph Krupa

Answered question

2021-12-06

For healthy adults, the mean pH level is μ=7.4, a new drug for arthritis has been developed. However, it is throught that this drug may change blood pH. A random sample of 33 patients with arthritis took the drug for three months. Blood tests showed that the sample mean from these 33 patients was a pH of 8.0 and it is known that σ=2.3. (Note, there is no unit for this type of data). Use α=0.05 level of significance to test the claim that the drug has increased the mean pH level of the blood.
If we use the classical approach, what would the criterion (step 3) be?
1) -1.645 or less
2) -2.33 or less
3) 1.645 or more
4) 2.33 or more

Answer & Explanation

hysgubwyri3

hysgubwyri3

Beginner2021-12-07Added 43 answers

Step 1
Null and Alternate Hypothesis:
H0:μ=7.4
HA:μ>7.4
Level of significance =0.05
Step 2
As we know the population standard deviation, we will use z-distribution
Using z-distribution
Critical region for two tailed test =[1.645,)
Therefore,
Answer: 1.645 or more

Do you have a similar question?

Recalculate according to your conditions!

New Questions in High school statistics

Ask your question.
Get an expert answer.

Let our experts help you. Answer in as fast as 15 minutes.

Didn't find what you were looking for?