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The placebo effect. The placebo effect is particularly strong in patients with Parkinson's disease. To understand the workings of the placebo effect, scientists measure activity at a key point in the brain when patients receive a placebo that they think is an active drug and also when no treatment is given. The same six patients are measured both with and without the placebo, at different times.
(a) Explain why the proper procedure to compare the mean response to placebo with control (no treatment) is a matched pairs t test.
(b) The six differences (treatment minus control) had the mean = -0.326 and s = 0.181. Is there significant evidence of a difference between treatment and control?
Kay Manning is a sales manager with two salespeople working for her. The ability of each salesperson to secure new accounts has historically been: Jesse Burkett can generate 4 new accounts per 10 visits to prospects
you want to give a bonus to the top 5 of your sales people and extra special attention to the bottom 25. average sales
the hours of study and the final exam grades have this type of relationship y 5.76hours 35.31. based on this linear
A national survey of restaurant employees found that 75% said work stress had a negative impact on their personal lives. A sample of 100 employees from a popular restaurant chain finds that 68 answer
Find all critical points of f (x) and classify them as maximums or minimums. State the intervals where f (x) is increasing and decreasing.
a friend of mine is giving a dinner party. his current wine supply includes 8 bottles of zinfandel 12 of merlot and 11
Their monitoring plan will take a random sample of 5 days sales per month and use the sample mean sales to identify shops that are under-performing. Establish the lower limit sales such that only 5% of the shops would have a sample sales mean belo..
an average of 5 cars arrive per hour at a restaurant. assume that the number of cars arriving perhour follows poisson
Research reports an F=ratio with df=3.36 from independent-measures research study. How many treatment conditions were reported in the study what was the total number of participants?
Employees what is the mean and standard deviation for the expected number of employees making more than $70,000 per year #question.
the senior executive of a publishing firm would like to train employees to read faster than 1000 words per minute. a
oil field pipes are internally coated in order to prevent corrosion. researchers investigated the influence that
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