Following is 2 by 2 table shows the given data:
Improvement | No improvement | Total | |
Drug | 57 | 94-57=37 | 94 |
Placebo | 51 | 89-51=38 | 89 |
Total | 108 | 75 | 183 |
Expected frequencies will be calculated as follows:
Following table shows the expected frequencies:
Improvement | No improvement | |
Drug | 55.475 | 38.525 |
Placebo | 52.525 | 36.475 |
Following table shows the calculations for chi square test statistics:
O | E | (O-E)^2/E |
57 | 55.475 | 0.04192204 |
51 | 52.525 | 0.04427653 |
37 | 38.525 | 0.06036665 |
38 | 36.475 | 0.06375942 |
Total | 0.21032464 |
Following is the test statistics:
3)
Degree of freedom: df =( number of rows -1)*(number of columns-1) = (2-1)*(2-1)=1
The critical value for 0.05 significance level is 3.841
Since test statistics is less than 3.841 so we fail to reject the null hypothesis.
Of the 94 participants in a drug trial who were given a new experimental treatment for...
Of the 93 participants in a drug trial who were given a new experimental treatment for arthritis, 57 showed improvement. Of the 90 participants given a placebo, 48 showed improvement. Use a 0.05 significance level to test the claim that improvement is independent of whether the participant was given the drug or placebo. Assuming independence between the two variables, find the expected frequency for each cell of the table. 1) Table of expected frequencies Improvement. No improvement Drug. ____________. ______________...
Of the 98 participants in a drug trial who were given a new experimental treatment for arthritis, 56 showed improvement. Of the 92 participants who were given a placebo, 49 showed improvement. Construct a two way table for this data and then use a 0.05 significance level to test the claim that improvement is independent of weather the participant was given the drug or a placebo. I'm stuck!!! Thanks!!
13) Fill in your answer in the Blank. Tests for adverse reactions to a new drug yielded the results given in the table. At the 0.05 significance level, test the claim that the treatment (drug or placebo) is independent of the reaction (whether or not headaches were experienced). Find the Test Statistic. Round off to three decimals. Drug Placebo 11 7 Headaches No Headaches 73 91
3. Consider a Phase II clinical trial designed to investigate the effectiveness of a new drug to reduce symptoms of asthma in children. A total of n=10 participants are randomized to receive either the new drug or a placebo. Participants are asked to record the number of episodes of shortness of breath over a 1 week period following receipt of the assigned treatment. The data are shown below. Placebo: 7, 2, 10, 5, 12 New Drug: 3, 6, 4, 11,...
Tests for adverse reactions to a new drug yielded the results given in the table. At the 0.05 significance level, test the claim that the treatment (drug or placebo) is independent of the reaction (whether or not headaches were experienced). Round your answer to 3 decimal places. Headaches No Headaches Drug Placebo 11 7 73 91 O p-value=0.180, evidence support claim Op-value=0.906, evidence support claim Oo ooo p-value=0.180, evidence not support claim p-value=0.906, evidence not support claim O p-value=0.018, evidence...
13. The data in Table 6-27 are collected in a randomized trial to test the efficacy of a new drug for migraine headaches. The following are characteristics of study participants overall and then organized by the treatment to which they are assigned TABLE 6-27Characteristics in Participants in Study of Treatment for Migraine Headaches All (n- 200) Placebo (n 100) New Drug (n 100) 32.0 (4.9) 31.9 (5.1) 32.8 (4.7 Mean (SD) age, years 51% 48% 54% % Male 78% 80%...
Investigators want to determine the effectiveness of a new drug in lowering cholesterol. They conduct a small clinical trial in which patients were randomized to receive the new drug or placebo. The total cholesterol was measured after ten weeks on the assigned treatment. The table below shows the results. Sample size (n) Mean Clostrol SD New drug 30 198.8 26.7 Placebo 30 215.4 30.3 Is there sufficient evidence to conclude a difference in mean cholesterol for patients on the...
2. Researchers are evaluating a new drug for the treatment of Type II diabetes. They ran- domly assign 20 volunteers with a history of poor glucose control levels to two groups the Treatment group gets the experimental drug on trial, while the Control group re- ceives a standard drug. At the end of the clinical trial, participants have their A1C (glycated hemoglobin, a measure of long-term blood glucose levels) tested, the results are summarized in the table below Group A1C...
1) Investigators want to determine the effectiveness of a new drug in lowering cholesterol. They conduct a small clinical trial in which patients were randomized to receive the new drug or placebo. The total cholesterol was measured after ten weeks on the assigned treatment. The table below shows the results. Sample Size (n) Mean Cholesterol SD New drug 30 198.8 26.7 Placebo 30 215.4 30.3 Is there sufficient evidence to conclude a difference in mean cholesterol for patients on the...
S. Chi-Squared Test of Independence Tests for the adverse reactions to a new drug vielded the results given in the table. At the 0.05 significance level, test the claim that the treatment is independent of the reaction (headache or no headache experienced). DrugPlacebo 7 Headache No headache 73 91 Hypothesis Ho: На: points Expected Values points Decision points Conclusion points S. Chi-Squared Test of Independence Tests for the adverse reactions to a new drug vielded the results given in the...