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1. Identify a decision process within your work or business interests that could be resolved based on data.
a. Describe the null and research hypotheses.
b. Compute (or use an educated guess for) an appropriate estimate and its standard error.
c. Find a confidence interval.
d. Test the hypothesis.
e. Interpret and explain your results.
There are predictable stages through which every critical thinker must pass. Under what circumstances might one regress from one stage to a previous one?
Suppose that the scores of architects on a particular creativity test are normally distributed.
What nonparameiric test can be used to distinguish total heart weight of males with left-heart disease with that of normal males? Write and Implement test and report a p-value.
Visa Card USA studied how frequently young consumers, ages 18 to 24, use plastic cards in making purchases. The results of the study provided the following probabilities.
A salesman must select 2 of the first component and 3 of the second to take on a sales call. How many different systems can the salesman select?
Use this information to find the upper and lower limits of the first class if you wish to construct a frequency distribution with 10 classes.
What is the Bonferroni adjustment? What would the Bonferroni adjustment be for a study with four groups for which a researcher decided to use t-tests?
Use the traditional method to test the given hypothesis. Assume that the population is the normally distributed and that the sample has been randomly selected.
Best Electronics, Inc. offers a "no hassle" returns policy. The number of items returned per day follows the normal distribution. The mean number of customer returns is 10.4 per day and the standard deviation is 2.3 per day.
Make an Excel line graph of the data on computer viruses. Discuss the underlying causes that might explain the trend or pattern.
The average age of the women was 45.582 with a standard deviation of 5.143. He uses this information to calculate a 95% confidence interval for the differnce in means, (-11.41, -5.422). The best interpretation of this interval is which of the foll..
The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages.
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