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These weekly exercises provide the opportunity for you to understand and apply statistical methods and analysis. Unless otherwise stated, use 5% (.05) as your alpha level (cutoff for statistical significance).
#1. What information does a correlation coefficient convey?
#2. State whether each of the following is an example of a positive correlation or a negative correlation.
A final exam in Math 157 is normally distributed and has a mean of 75 with a standard deviation of 12. If 36 students are randomly selected, find the probability that the mean of their test scores is greater than 70.
Can you describe the tranformational leader style in a CEO from a Hotel Corporation?
A IRS auditor randomly selects 3 tax returns from 48 returns of which 9 contain errors. What is the probability that she selects none of those containing errors? Round to four decimal places.
Explain the importance of random sampling. What problems/limitations could prevent a truly random sampling and how can they be prevented?
What is the probability that the doctor's salary is higher than $500,000? What is the probability that the doctor's salary is less than $100,000?
an ecologist wishes to mark off a circular sampling region having radius 10 meters. however the radius of the resulting
a machine fills bottles with 64 fluid ounces of liquid. the quality-control manager determines that the fill levels are
If 2 randomly chosen students are surveyed and both feel optimistic about their employment prospects, what is the probability that both were math students?
question what is a type i error? explain how the cumulative type i error affects your decision making. how are the two
Are the events D_2 and D_4 independent? Do the appropriate calculation to answer this question. Then explain why your answer makes sense.
A researcher is curious whether or not a person's level of education influences his or her personal outcome. Identify the most logical (i) response
Generate z scores for a variable in grades.sav and report and interpret them. Analyze cases to either reject or not reject a null hypothesis
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