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1. Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
2. How can you avoid bias when selecting samples for human services research? List the three measures of variability and provide one example of each. If in a response team, what may these measures of variability tell a team leader about individual and team performance?
A researcher conducts some research in which they identify a significant positive correlation (r =0.42) between the number of children a person has and their life satisfaction. Which of the following is it inappropriate to conclude from this resea..
Describe the data appear the strength of the relationship among variables is sufficient to warrant using linear regression forecasting.
Utilize this information to construct a probability table, and then calculate each of the given probabilities:P (female and domestic car).
For this same sample of n = 45, find out the width of confidence interval around population mean? Illustrate all work.
a) Determine the proportion of instances that the duration was less than 240 seconds. Also express the proportion as a percent. (hint: proportion is number of successes divided by total number.)
An ANOVA procedure is used for data that was obtained from four sample groups each comprised of five observations. The degrees of freedom for the critical value of F are:
Woodco manufactures tables and chairs. Each table and chair must be made entirely out of oak or entirely out of pine. A total of 150 board feet of oak and 210 board feet of pine are available.
A random sample of 15 paired observations has a correlation of -.46. Can we conclude that the correlation in the population is less than zero? Use the .05 significance level.
A chance sample of 50 families revealed an average or median of $112,000 and a standard deviation of $40,000. What is the standard error of the average or median?
Modify above problem (Problem 8th) so that each hardware vendor now demands seventy-five (75) units. Any units available from the vendors that are not shipped cost nothing.)
At the .10 significance level you will test to determine if there has been an increase in selling time. Assuming we are using a t test what will be the critical value"?
The local operations manager for the IRS must decide whether to hire 1, 2, or 3 temporary workers. He estimates that net revenues will vary with how well taxpayers comply with the new tax code.
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