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Researchers wanted to explore self-esteem in adolescent boys and girls. They used a 5 point Likert-type self-esteem inventory; 1=strongly disagree and 5= strongly agree. What if their results yielded the following: t=1.71, d=.90. What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and girls? What was the purpose of calculating a Cohen's d? When is a Cohen's d calculated? Interpret d=.90. What does it mean in this example?
If person is selected at random and tested, determine the probability of that person having an IQ score between 85 and 115. Make use of EXCEL to help determine the probability.
What is the probability that the first and the last ones on the EP are the relationship songs?
Suppose that the distribution of weekly water usage for single-family homes in a particular city is mound shaped and approximately symmetric. The mean is 1400 gallons, and the standard deviation is 300 gallons.
What is the relationship between the variance and the standard deviation?
Find a 95% confidence interval for the proportion p of the inner-city, working-class group who eventually became alcoholics.
Create ADM/PERT diagram. Determine the critical path.
Suppose these data represent whole population. Determine the population mean and population standard deviation.
Establish an approximate design to MTBF required for a system that will result in an approximate minimum total cost over a five year period if the system is to be operated 7500 hours per year
Probability using Pareto chart - Evaluate the probability of randomly selecting an adult from the sample who doesn't always eat healthy foods because he or she has no time to cook or is confused about nutrition.
What is the 99% confidence interval for the true proportion of all e-mail subscribers that opened the e-mail within 24 hours of receiving it?
Impact on sampling of increasing sample size is: The potential for extreme sampling error is reduced.
Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company.
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