A new drug to treat high cholesterol is being tested by pharmaceutical company. The cholesterol levels for 18 patients were recorded before administering the drug and after. The average difference in cholesterol levels (after  before) was 4.19 mg/dL with a standard deviation of 8.055 mg/dL. Using this information, the calculated 90% confidence pairedt interval is (0.887, 7.493). Which of the following is the best interpretation of this interval?
Question 8 options:









A medical researcher wants to determine if the average hospital stay after a certain procedure is less than 14.97 days. The hypotheses for this scenario are as follows: Null Hypothesis: μ ≥ 14.97, Alternative Hypothesis: μ < 14.97. If the researcher randomly samples 26 patients that underwent the procedure and determines their average hospital stay was 15.68 days with a standard deviation of 7.183 days, what is the test statistic and pvalue of this test?
Question 9 options:









Question 1
We are 90% confident that the average difference in cholesterol levels between those who would take the drug and those who would not is between 0.887 and 7.493.
Question 2
Test Statistic :
t = 0.504
Test Criteria :
Reject null hypothesis if
= 0.504 >  2.485
Result : Fail to reject null hypothesis
Decision based on P value
P  value = P ( t > 0.504 ) = 0.6907
Reject null hypothesis if P value <
level of significance
P  value = 0.6907 > 0.01 ,hence we fail to reject null
hypothesis
Conclusion : Fail to reject null hypothesis
Test Statistic: 0.504, PValue: 0.6907
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