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How can a non-linear relationship among two variables influence the correlation coefficient? For example, ability to pay attention and the level of stimulation in the environment do not demonstrate a linear relationship. At some point, too much stimulation will limit the ability to focus and pay attention. What would happen to the size and the sign of the correlation coefficient if we correlated these two variables? How can researchers work around this issue?
First-order regression model was fit to data. Part of printout follows?
How long do new batteries last on a camping trip? A random sample of n1 = 42 small camp flashlights were installed with brand I batteries and left on until the batteries failed.
Explain the terms parameter and statistics. Make sure the concepts of population and sample are included in the definitions.
Using the results, describe the effect of an outlier or extreme value on the confidence interval.
What is the probability of correctly guess the right code on the first try? What is the probability of not correctly guessing the right code o the first try?
Suppose the download times for a commercial tax preparation site are normally distributed with a mean download time of 2.0 seconds and a standard deviation of 0.5 second.
How might you go about creating a stronger regression model? For example, you have a multiple regression model with an adjusted R-Square of 0.49, which would explain 49% of the variance of the dependent measure
The mean increase is $332, and the standard deviation is $108. Give a 99% confidence interval for the mean amount of the increase. Does omitting the annual fee induce customers to charge more on their credit cards?
What happens to the Maximum Error of Estimate as the sample size gets larger?
When there are multiple observations per subject, what issues are there with doing a MNL and an ordered logit model, answer in detail and provide example.
What can you tell me about the direction, strength and significance of this association and What would you expect for somebody without any formal education whatsoever and what can you tell me about the nature of this relationship?
Compute Pearson's correlation coefficient between age and amount spent on this particular product.
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