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Dr. Zak also gave his students the Beck Depression Inventory (BDI). The correlation between his test and the BDI was r =.67. Evaluate this correlation. What does this correlation tell us about the relationship between these two instruments?
Suppose we have the following information from a simple regression: What is the coefficient of determination? What is the correlation coefficient?
The "t-statistic" for testing whether the slope parameter was unity or not was -3.6. What is the estimated standard error for the estimated slope coefficient?
The standard IQ test has a mean of 100 and a standard deviation of 13. We want to be 98% certain that we are within 2 IQ points of the true mean. Determine the required sample size.
Drug manufacturer knows that for a certain antibiotics, the average number of doses ordered for a patient is 20. Steve Simmons, a salesman for the company
Find values for the mean and variance of X. Using a distribution approximation, calculate the probability that there are more than 10 faulty disks in a box of 500 disks.
The intensity and frequency of hurricanes increases by 2% over the historical projections and claims increase proportionately. Evaluate data using the appropriate test for significance. Rationale for using the test is clear.
Let x be a nilpotent element of the commutative ring R i.e. x^m for some positive integer m. Prove that x is either zero or a zero divisor
Using the .05 level, what should the researcher conclude? Solve this problem explicitly using all five steps of hypothesis testing.
The mayor of a small town would like to know whether a local bond issue is likely to pass or not. He mails a survey to 500 randomly selected voters.
For any hypothesis test, if the value of a parameter being tested falls outside the confidence interval for the same level of a, the correct decision is to reject the null hypothesis. Is this True or False?
A random sample of 80 observations from a normally distributed population produced a mean x(bar over the x)= 22.6 . Find a 95% confidence interval for the population mean m if the population standard deviation
A firm has tendered for two independent contracts. It estimates that it has probability 0.4 of obtaining contract A, and probability 0.1 of obtaining contract B. Find the probability that the firm:
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