An experiment was designed to compare the lengths of time that four different drugs provided pain relief after surgery. The results (in hours) follow. Is there enough evidence to reject the null hypothesis that there is no significant difference in the length of pain relief provided by the four drugs at α = .05?
Drug | |||
A | B | C | D |
3 | 5 | 8 | 2 |
8 | 5 | 8 | 2 |
5 | 5 | 11 | 4 |
8 | 5 | 12 | |
12 |
(a) Find the test statistic. (Give your answer correct to two
decimal places.)
An experiment was designed to compare the lengths of time that four different drugs provided pain...
An experiment was designed to compare the lengths of time that four different drugs provided pain relief after surgery. The results (in hours) follow. Is there enough evidence to reject the null hypothesis that there is no significant difference in the length of pain relief provided by the four drugs at α = .05? Drug A B C D 2 4 8 2 2 6 9 3 4 6 12 4 4 5 12 12 (a) Find the test statistic....
An experiment was designed to compare the lengths of time that four different drugs provided pain relief after surgery. The results (in hours) follow. Is there enough evidence to reject the null hypothesis that there is no significant difference in the length of pain relief provided by the four drugs at α = .05? Drug A B C D 4 4 9 2 4 4 8 4 6 4 12 2 5 5 9 11 (a)...
To compare the mean lengths of time required for the bodily absorption of two drugs A and B, 20 people were randomly selected and assigned to receive one of the drugs. The length of time (in minutes) for the drug to reach a specified level in the blood was recorded, and the data summary is given in the table. Drug A Drug Do the data provide sufficient evidence to indicate a difference in mean times to absorption for the two...
12;" In an experiment designed to measure the time necessary for an inspector's eyes to become used to the reduced amount of light necessary for penetrant inspection, the sample average time for n - 12 inspectors was 6.13 sec and the sample standard deviation was 1.75 sec. It has previously been assumed that the average adaptation time was at least 7 sec. Assuming adaptation time to be normally distributed, does the data contradict prior belief? Use the t test with...
2. A clinical pharmacologist wishes to compare two pain-relieving drug products (A and B). 6 subjects were allotted at random to drug A and 8 to drug B. The results from the experiment are given as follows. 7 Drug A Drug B 4. 9 Test the hypothesis that the drug products have the same effect on pain relief at 5% significance level.
For one binomial experiment, n1 = 75 binomial trials produced r1 = 60 successes. For a second independent binomial experiment, n2 = 100 binomial trials produced r2 = 85 successes. At the 5% level of significance, test the claim that the probabilities of success for the two binomial experiments differ. (a) Compute the pooled probability of success for the two experiments. (Round your answer to three decimal places.) (b) Check Requirements: What distribution does the sample test statistic follow? Explain....
PRE-TEST QUESTION:
5. Seven people were selected for a study to compare pain relievers (Drug A and Drug B). Each person was given both drugs, one after the other. There was enough time between the two drugs so that the first one did not affect the second one. The drug that was given first was determined randomly. The people in the study gave a pain relief score on a scale of 1 to 100. Data and an Excel analysis are...
A small pilot study is run to compare a new drug for chronic pain to one that is currently available. Participants are randomly assigned to receive either the new drug or the currently available drug and report improvement in pain on a 5-point ordinal scale. 1 = Pain is much worse, 2 = Pain is slightly worse, 3 = No change, 4= Pain improved slightly, 5 = Pain much improved.Use the Mann-Whitney U test to determine if the new drug...
Castaneda v. Partida is an important court case in which statistical methods were used as part of a legal argument. When reviewing this case, the Supreme Court used the phrase "two or three standard deviations" as a criterion for statistical significance. This Supreme Court review has served as the basis for many subsequent applications of statistical methods in legal settings. (The two or three standard deviations referred to by the Court are values of the z statistic and correspond to...
Castaneda v. Partida is an important court case in which statistical methods were used as part of a legal argument. When reviewing this case, the Supreme Court used the phrase "two or three standard deviations" as a criterion for statistical significance. This Supreme Court review has served as the basis for many subsequent applications of statistical methods in legal settings. (The two or three standard deviations referred to by the Court are values of the z statistic and correspond to...