For this problem you are need to set up a null and alternate hypothesis in order to test the claim. You cannot make a determination from the sample provided without identifying the null and alternate hypothesis. From there your only conclusion can be to reject or fail to reject the null hypothesis. Please correct your solution to identify your null and alternate hypothesis and then make the conclusion based on the null hypothesis.

The pH of blood for normal healthy adults is generally accepted to be = 7.4. A new drug being tested is thought to decrease the pH to unhealthy low levels. A random sample of 36 patients took the drug over a 5-month period. Blood tests showed that the sample mean was 6.7 with a sample standard deviation of 1.9. Using = 0.01, test the claim that the drug has lowered the mean pH level.

Solution:

Testing the claim we can determine that at a 1% significance level, there is not enough evidence to support the claim that the drug has lowered the mean PH level.