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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
Do the following: (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).
Convert these four officers' scores to standardized z-values.Do you believe there was adequate reason to question these four exam scores? What suppositions are you making?
If alpha level is changed from a = 0.05 to a = 0.01. What occurs to boundaries for critical region?
Cash back when they make a purchase at a shoe store. or C. an entry into a sweepstakes when they make a purchase. I need to determine the probability of each option.
There used to be an ad on TV that claimed one toothpaste was proven to be more effective in fighting tooth decay than another. One of statistics professors was interested in the study, and after 6 ads finally got the address to write away for it f..
When trucks arrive at the Ambassador Bridge, each truck must be checked by customs agents. The times are exponentially distributed with a service rate of 10 per hour. What is the probability that a truck requires more than 15 minutes to be checked..
Find out the marginal probability density function for the provided value. Assume that two random variables, X and Y, have bivariate pdf given by:
At the .05 significance level can we conclude that there is more variation in the processing time of the new machine?
I'm trying to determine what happens to the sample size if the level of confidence is reduced from 95% to 90% but the allowable error and the standard deviation remain
Discuss any limitations (inaccurate data; incomplete information; not enough samples for testing)can have an regression analysis.
What is the probability that a randomly chosen U.S. adult invests in stocks, given that s/he invests in fixed income instruments? Round your answer to decimal places.
A random sample of gasoline taxes (in cents) is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 44.7 cents?
In a test of the independence of two variables, one of the variables has two possible categories and the other has three possible categories.
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