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A psychologist is studying the effect of drug and electroshock therapy on a subject's ability to solve simple tasks. The number of tasks completed in a 10-minute period is recorded for subjects who have been randomly assigned to compare four treatment groups: drug with electroshock, drug without electroshock, no drug with electroshock, and no drug/no electroshock. Sixty-four subjects were randomly selected students from a large local university.
Managers at Beta Technologies, Inc., have collected current annual salary figures and potentially related data for a random sample of 52 of the company's full-time employees.
What is the chance that stock will fall by more than 15% next month? What extra assumption are you making when replying this question?
Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
Develop a 99% confidence interval for the population proportion.
Does it appear that the treatment is effective? That is, is it very likely that we would observe only 6/200 contract hepatitis when 7% of the population is known to do so?
Graph the least-squares line on your scatter diagram. Be sure to use the point (x, y) as one of the points on the line.
the time to complete a manual task in a manufacturing operation is considered a normally distributed random variable
In addition, explain why it is important to ensure that your participants understand fully the extent of the research before you begin.
An automobile assembly line operation has a scheduled mean completion time of 2.2 minutes. Because of the effect of completion time on both preceding and subsequent assembly operations, it is important to maintain the 2.2 minute mean completion ti..
1. suppose an experiment has five equally likely outcomes e1 e2 e3 e4 e5. assign probabilities to each outcome and
Does this data support the researchers' hypothesis? Test the relevant hypotheses using α = .10 by first calculating a P-value.
At the end of the Halloween Festival the organizers estimated that a family of participants spent in average $50.00 with a standard deviation of $15.00. If 49 participants (49 = size of the sample) are selected randomly, what's the likeihood that ..
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