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Question: Antidepressants. A study compared the effectiveness of several antidepressants by examining the experiments in which they had passed the FDA requirements. Each of those experiments compared the active drug with a placebo, an inert pill given to some of the subjects. In each experiment some patients treated with the placebo had improved, a phenomenon called the placebo effect. Patients depression levels were evaluated on the Hamilton Depression Rating Scale, where larger numbers indicate greater improvement. The scatterplot at the top of the next column compares mean improvement levels for the antidepressants and placebos for several experiments.
a) Is it appropriate to calculate the correlation? Explain.
b) The correlation is 0.898. Explain what we have learned about the results of these experiments.
A cognitive psychologist measures the reaction times of 6 subjects to emotionally laden words.- Compute the Mean, Median, Mode, Range, Standard deviation, and Variance cognitive.
How many commuters must be randomly selected to estimate the mean driving times of Chicago commuters? If we want 99% confidence that the sample mean is within 2 minutes of the population mean, and the population standard deviation is known to be 1..
A study has results that seem fine, but there is no clear association to social change. What is missing? A correlation test was conducted to determine whether a relationship exists between level of income and job satisfaction.
Presume a second independent poll of 1000 voters (800 from community 1 and 200 from 2). What is prob. A is predicted the winner by one poll and B is predicted the winner by the other?
In a random sample of 150 sports cars, 60 failed emissions on the first pass. Is there sufficient evidence to indicate that the percentage of first failure for sports cars is higher than the percentage for all passenger cars?
Instructions: Perform the 5-step hypothesis testing procedure, HERE ARE THE STEPS THAT NEED TO BE FOLLOWED & THE RAW DATA IS BELOW. Hypothesis Testing Steps given
Researchers in Food Science studied how big people's mouths tend to be. They measured mouth volume by pouring water into the mouths of subjects.
The number of hours spent online by college students is claimed to be 22.5 hours per week with a standard deviation of 2.1 hours.
The results of a 2013 Gallup poll about people's position on abortion (pro-life or pro-choice) by region in the country are summarized in the contingency table below.
a sample of 50 days showed that a fast food restuarant served an average of 182 customers during lunchtime. the sample
If the sample mean is 15.2 oz. and the sample standard deviation is 0.40 oz., find the 95% confidence interval of the true mean.
a survey found that womens heights are normally distributed with mean 63.9 in and standard deviation 2.2 in. a branch
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