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Four research participants take a test of manual dexterity (high scores mean better dexterity) and an anxiety test (high scores mean more anxiety). The scores are as follows.
Person Dexterity Anxiety1 1 102 1 83 2 44 4 -2
(a) Make a scatter diagram of the scores; (b) describe in words the general pattern of correlation, if any (c) figure the correlation coefficient; (d) figure whether the correlation is statistically significant (use the .05 significance level, two-tailed); (e) explain the logic of what you have done, writing as if you are speaking to someone who has never heard of correlation (but who does understand the mean, deviation scores, and hypothesis testing); and (f) give three logically possible directions of causality, indicating for each direction whether it is a reasonable explanation for the correlation in light of the variables involved(and why).
At 95% level of confidence, can we conclude that the babies using the Gibbs product gained less weight?
What is Excel formula in B9 giving first value of coefficient in the objective function?
A new county hospital is attempting to determine whether it needs to add a particular specialist to its staff. Five percent of the general hospital population in the county contracts the illness the specialist would treat.
A standard deviation of $125. A) what is the point estimate of the population mean? B) develop a 95% confidence interval for the population mean.
Explain the difference between one-factor and two-factor ANOVA. (b) Write the linear model form of one-factor ANOVA. (c) State the hypotheses for a one-factor ANOVA in two different ways.
Use expected collision claim amount to find out the collision insurance premium that would permit the company to break even on collision portion of policy.
How to calculate expected difference between the samples means, and how does larger variability affect the size of the standard error for the sample mean difference?
You can allow the cup to overfill 4% of the time. What amount should you set as the mean amount of coffee to be dispensed?
The following sample data shows the quarterly earnings in millions for two US companies. Your research interest is finding if the average earnings for these companies are different.
Test whether there is a difference in the mean of times men and women and determine the p-value.
Find the indicated percentage for the normally distributed variable. Round your answer to two decimal places, if necessary.
In a study about postage tariffs and revenue, the European Economic Community wanted to look at the relationship between the number of postal employees in a country and the amount of domestic mail that was processed. They collected data for six di..
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