The table shows the results of an experiment in which subjects taking either a drug or a placebo either reported fatigue or did
not report Teague.
Which statements are true?
Chose all answers that are correct.
- more subjects took the drug than took the placebo.
- twenty-eight percent of the subjects did not report fatigue.
- a greater percent of the subjects did not report fatigue.
-a greater percentage of subjects taking the placebo did not report fatigue.
Which statements are true?
Chose all answers that are correct.
- more subjects took the drug than took the placebo.
- twenty-eight percent of the subjects did not report fatigue.
- a greater percent of the subjects did not report fatigue.
-a greater percentage of subjects taking the placebo did not report fatigue.
2 answers:
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Answer:
The 99% confidence interval is between 62.36%(lower bound) and 89.64%(upper bound).
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of
, we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
A sample of 65 students from the freshmen class is used and a mean score of 76% correct is obtained.
This means that
99% confidence level
So , z is the value of Z that has a pvalue of
, so
.
The lower limit of this interval is:
The upper limit of this interval is:
0.6236*100 = 62.36%
0.8964*100 = 89.64%
The 99% confidence interval is between 62.36%(lower bound) and 89.64%(upper bound).