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1) When is the correlational research method appropriate? Describe an example of an actual research study from a credible source or the news that illustrates the use of the correlational method.
(2) Why did the researchers use this method?
(3) What are the limitations to the correlational method in terms of the conclusions that can be made?
(4) What is a positive correlation? Negative? Zero? What does the number itself signify? Give several examples from the article you selected to illustrate your point.
(5) 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?
(6) What about floor and ceiling effects? How can these issues preclude a significant correlation coefficient from being discovered?
In order to monitor the ecological health of the Florida Everglades, various measurements are recorded at different times. The bottom temperatures are recorded at the Garfield Bight station
Using the emperical rule solve the following problems for a distribution with a mean of 20 and a stardard diviation of 5. At least what percentage of the values will fall between 15 and 25.
FBI Report Do greater universities tend to have more property crime, would you speek that the correlation is low, moderate or high
The probability of error in the transmission of a binary digit over a communication [2] channel is 1=103. Write an expression for the exact probability of more than 3 errors when transmitting a block of 103 bits. What is its approximate value? Ass..
Roberta scored in the 85th percentile on a standardized test of reading ability. What is Roberta's associated z score?
Use this information to make a 95% confidence interval to evaluate true average number of copies made each day at this company.
Analyze these data and summarize your findings for managers. Explain how information can be used by decision makers. Assume that sales per customer are normally distributed.
Find the lowest possible score a candidate can score and still qualify. Assume the scores are normally distributed.
To test H0: against the alternative H1: in Q 1.5 above, the degrees of freedom of a suitable t-statistic is: In a study of the effect of oral contraceptives (OCs) on blood pressure, measurements were made on 10 OC users (x) and 14 non-users (y).
A sample of 4 trucks is randomly selected. What is the probability that 2 of those tested have defective brakes.
Report a table of marginal means for each level of each of the three factors.
Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
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