A researcher decides to lower the alpha level that determines the critical region(s) prior to conducting a hypothesis test. This will increase the power of the hypothesis test. True or False?

A researcher wanted to examine the effectiveness of Vitamin C on the number of colds a year. The researcher obtained a sample of adults and asked to take Vitamin C daily. The average number of colds a year among adults is known to have the average of μ = 3On the basis of this sample, can the researcher conclude that Vitamin C has an effect on the number of colds a year? Use alpha =.05 two-tailed test. Colds: 2,2,2,1,3,3,1,2 Conducta two-tailed test with alpha = .05. Q1: State your null and research hypotheses using complete sentences Q2: What is the df? Q3: What are the cut-off points Q4: What is the standard deviation? You can just include the answer for the mean, SS, and the standard deviation. No need to type your computation. Q5: What is the estimated standard error? Show your computation. Q6: What is the t-value? Show your computation. Q7: State your conclusion thoroughly.

Would like to know if I calculated this correctly. Please see my answers for the questions. Endothelin is a powerful vasoconstrictor peptide derived from the endothelium. The contribution of endothelin to blood-pressure regulation in patients with hypertension was as-sessed by studying the effect of an endothelin-receptor antagonist, Bosentan. In the study, 293 patients with mild to moderate hypertension were randomized to receive one of four oral doses of Bosentan (100, 500, 1000, or 2000 mg daily), a placebo, or the ACE (angiotensin-converting enzyme) inhibitor enalapril (an established antihypertensive drug) [18]. The reported mean changes in systolic blood pressure (SBP) over a 24-hour period are shown in Table 11.23.  Table 11.23 Mean change in SBP over 24 hours Group Mean Change Bosentan dose (mg) ln(dose) Placebo -0.9 1 0 100mg bosentan -2.5 100 4.61 500 mg bosentan -8.4 500 6.21 1000 mg bosentan -7.4 1000 6.91 2000 mg bosentan -10.3 2000 7.60 11.61 What test can…

review(37b):  A psycharist hypothesized that patients with schizopherina , who stayed in the hospital the longest would score the lowest on a mental oreintation test. She collected data for six patients   with shizophernia which are listed below. Years of Hospitalization                              Mental oreienation     6                                                                 5     7                                                                3     12                                                              2     5                                                               7     3                                                               8     8                                                               4 test the hypothesis at 5% level of signifcance usinf the 5 step procedure..Round your answer to 2 decimal places