This is a two sample t test of two independent samples where we are testing the value of the difference between the two population means.
The t statistic in this situation has a n1+n2-2 degrees of freedom.
So here it is : 30+30-2 = 58
So option b is correct.
An independent measures study was conducted to determine whether a new medication called "Byeblue" was being...
a new drug, dicacibro, is being tested
5:24 PM account.coachingactuaries.com 12th percintile in z table-Go. 2 of 5 0113:42 Question 2 drug, Dicacibro, is being tested to treat Actuarial Exam Anxiety 60% of the test subjects are given Dica ibro and the remainder are given a placebo 80% of the patients taking Dicacibro experience reduced anxiety. 58% of all patients experience reduced anxiety What proportion of the placebo group experience reduced anxiety? A 0.63 B 0.10 c 0.14 D o.04...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment (with magnets) group and the sham (or placebo) group. The results are a measure of reduction in back pain. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a 0.05 significance level...
Treatment Sham Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment (with magnets) group and the sham (or placebo) group. The results are a measure of reduction in back pain. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a 0.05...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment (with magnets) group and the sham(or placebo) group. The results are a measure of reduction in back pain. Assume that the two samples are independent simple random samples selected from normally distributedpopulations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a 0.05 significance level for both...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment (with magnets) group and the sham (or placebo) group. The results are a measure of reduction in back pain. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a 0.05 significance level...
Question 12 10 pts A medical study was conducted to investigate whether taking a low- dose aspirin reduces the chance of developing colon cancer. As part of the study, 1000 adult volunteers were randomly assigned to one of two groups. Half of the volunteers were assigned to the experimental group that took a low-dose aspirin each day, and the other half was assigned to the control group that took a placebo each day. At the end of six years, 15...
QUESTION 19 For an independent-measures research study, what is measured by Cohen's dori?? a. Whether or not treatment means are significantly different b. The size of the difference between the two treatements OC. The risk of committing a Type I error d. Whether the difference between the two treatments is likely to have occurred by chance QUESTION 20 A researcher conducts an independent samplest test with df = 50. If the two samples are the same size, then how many...
Treatment Sham Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment (with magnets) group and the sham (or placebo) group. The results are a measure of reduction in back pain Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. 17 0.57 x...
Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment (with magnets) group and the sham (or placebo) group. The results are a measure of reduction in back pain. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Use a 0.05 significance level for both parts. Treatment: µ=µ1; n=14;...
The November 17, 1994 issue of The New England Medical Journal reported on a study of the effects of hormone therapy on middle-aged women. About 950 women took part in the study; half were selected randomly to receive the hormone therapy and the other half were given a placebo (they did not know which). After about a year, blood tests were conducted on each subject by a lab technician who was unaware of which group (treatment or placebo) the blood...