7. Researchers are studying the pain-killing effects of a new drug excedrol.They administered the drug to a test sample and a placebo to a controlsample. People reported the improvement in their symptoms on a scaleof 1 to 5. The results arest.dev.nmeanExcedrolPlacebo50 3.3550 2.12 1.241.80At the level of 1%, test the hypothesis that excedrol performs betterthan placebo.

We let sample 1 as the Excedrol group and sample 2 as the Placebo group. nmeanstandard…

Answered: 7. Researchers are studying the…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.1: Measures Of Center

Problem 4GP

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A researcher wants to evaluate the effectiveness of a patch he thinks will significantly decreases lower back pain. Priorto testing, each of n=8 patients rated their current level of back pain. After wearing the patch for 90 minutes, a second rating is recorded. The data shows a mean difference of MD=-4 and SS=56. Do the results indicate a significant decrease? use a level of significance of .01.
How is my work? Should anything be changed? A researcher wanted to examine the effect of a new math study skills program on second graders. Fifteen students took the new study skills program for six weeks and then took a standardized math exam, which is known to have a population mean score of µ = 80. The scores on the exam for the 15 students (who took the study skills program) are reported below. Scores on the standardized math exam for the 15 students:78, 85, 83, 75, 81, 85, 84, 82, 78, 83, 78, 90, 85, 83, 81 Test to see whether the students who took the new study skills program have significantly higher test scores than the national average. Perform the appropriate test in SPSS using α = .05 a. State the null and alternative hypotheses below. Null hypothesis: H0: μ = 80. Alternative hypothesis: H1: μ > 80 b. What type of test should be run on the data (be specific with the exact name of the test)? For example, don’t just state “t test,” but the specific t-test used. One sample…
Investigators wished to study whether pregnant women over the age of 42 were more likely to suffer from postnatal depression than the general population. The mean Edinburgh Postnatal Depression Scale rating for the population is estimated to be about 21. The 121 women over the age of 42 in the study reported a mean EPDS score of 23 (SD=1.7). You are interested in investigating if there a significant difference between the women in the study and the general population. What kind of sample and outcome is this?
A sample of N = 9 individuals participates in a repeated measures study that produces a sample mean difference of X = 4.25 with SS = 128 for the difference scores. Is this mean difference large enough to be considered a significant increase?
Dr. S. compared her experimental group to a control group using a t test and concluded that her t was significant at the 1% level. If Dr. S. replicates her study using a similar sample of participants, she is most likely: to find that the experimental group is different from the control group; to find that the experimental group is similar to the control group; to find that the distribution of scores in the experimental group resembles a normal curve; however, the distribution of scores in the control group does not resemble a normal curve; d. The experimental group scores were correlated with the control group scores
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