A study was conducted to investigate whether the \"placebo effect\" exists in pe

Question

A study was conducted to investigate whether the "placebo effect" exists in people who are made aware that so known as a "sugar pill"). A placebo is a "drug" with no active medical ingredient. In the study, 42 patients who suffer from irritable bowel syndrome (IBS) were split into two groups. The patients in the treatment group were given placebo medication to take twice a day and were told that the pills were sugar pills that had no active ingredient. The control group was not given any medication. The researchers used a scale of 1 to 100 to quantify the severity of pain related to IBS in each patient. The result of the study was that the difference between mean pain severities for the patients in the two groups was statistically significant. The following paragraphs describe the details of the statistical analysis performed. Fill in the blanks with words from the word bank to the right. Note that six words will not be used. The was that there would be no margin of error | treatment-p·control difference in mean pain severity between the treatment group and the control group. The would be a difference. Since the p-value was less than the was that there null hypothesis FTR Ho , the statistical decision was to alternative hypothesis Reject Ho This test is best described as a t-test. confidence level level of significance In order to estimate the magnitude of the difference in mean pain sampling distribution severity, a 95% confidence interval was constructed by adding a point estimate to, and subtracting it from, the degrees of freedom As we would expect, it did not contain one sample zero two sample The 95% refers to the long run percentage of the time that, under repeated sampling, similarly constructed t-table paired

Explanation / Answer

a) The null hypothesis....

b) The alternative hypothesis

c) p value less than level of significance

d) decision was to Reject Ho

e) two sample t test

f) Adding a Margin of errror

g) u treatment - u control

h) didnot contain zero

i) 95% confidence level

j) point estmatei

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