Data Analysis: Mean and Standard Deviation
The mean and standard deviation are the statistics for this data set.
The mean tells the
average for the data set.
The standard deviation tells how far from the average the rest of the
numbers are
likely to be.
Group 1: Antiquil
Group 2: Placebo
40
37
35
35
27
34
18
24
30
29
28
14
11
23
23
25
30
32
13
37
16
30
17
30
26
29
22
22
19
23
17
31
29
28
10
20
Mean: 22.83333333
Mean:
27.94444444
Stand. Dev.: 8.3753841
Stand. Dev.:
6.197458893

STATISTICAL ANALYSIS REPORT
6
Data Analysis: Histogram
.
Data Analysis: Shape
The result of the distribution shape shows the results of the medication and the placebo
are too close, to prove the claim, that Antiquil is effective in decreasing withdrawal and craving
symptoms, with little to no side effects, for individuals recovering from alcohol
Hypothesis: Whether One Mean is Higher
The mean for one group was higher.
By using excel and creating the histogram and
graph for the data set, the results of the calculations showed that the mean of group 2 (placebo)
was higher than the mean of group 1 (Antiquil).
Hypothesis: Null Hypothesis and Alternative Hypothesis
Null Hypothesis
–
Results did not differ between the two study groups, Antiquil, and

STATISTICAL ANALYSIS REPORT
7
placebo. Neither showed signs of decreasing the withdrawal and craving symptoms, with little to
no side effects, for individuals recovering from alcohol.
.
H
0
: π ≤ 20
Alternative Hypothesis
–
The study group receiving Antiquil showed signs of positive
changes in withdrawal and craving symptoms. The study group receiving the placebo did not
show signs of change in withdrawal and craving symptoms.
H
a
: π > 20
This hypothesis means that the study is trying to prove that Antiquil is effective in
decreasing the withdrawal and craving symptoms, with little to no side effects, for individuals
recovering from alcohol. The OCDS will determine that the hypothesis is correct if the results
for the Antiquil group show effectiveness when comparing the numbers for both groups.
However, it can also prove that it does not work.
The null hypothesis would indicate a placebo
effect. The OCDS will prove that Antiquil will not be effective when comparing numbers for
both groups.
Results: Valid
Scenario 4 is a study that has a data set of 36 individuals recovering from alcohol
addiction. The individuals were split into two groups of 18, in which one group received
Antiquil, and the other group received a placebo. The drug Antiquil is used to suppress the
cravings for alcohol. Both groups were tested, after three weeks, for signs of withdrawal and
craving symptoms, with little to no side effects using the Obsessive-Compulsive Drinking Scale
(OCDS). During post-treatment, the OCDS was used to measure the participants' ruminations
about alcohol during non-drinking periods, using a score range of 0-40.
The higher the score
means higher levels of rumination based on the 0-40 score range, so to prove that Antiquil is