Emery Adams

Questions

• What is the relationship between the normal curve and the standard deviation?
• Can the standard deviation be greater than the mean?
• Can the standard deviation ever be negative?
• How do I summarize the possible outcomes of a random variable and their associated probabilities?
• What is the standard error?
• Is covariance a measure of variability?
• What is the variance of z=2x+3y, in terms of the variances of x and y?
• What is the difference between the line of best fit and the least squares regression line?
• John received a score of 75 on a math test where the mean was 50. If his score is 2.5 standard deviations away from the mean, what is the variance of the classes test scores?
• What is a standardized regression coefficient?
• What is the variance of {5, 3, 6, 14, 8, 10, 3, 17, 19, 9}?
• Two urns contain white balls and yellow balls. The first urn contains 2 white balls and 7 yellow balls and the second urn contains 10 white balls and 4 yellow balls. A ball is drawn at random from each urn. What is the probability that both balls are w?
• What does it mean when the slope of the best-fit line is negative?
• In a club there are 10 women and 7 men. A committee of 6 women and 4 men is to be chosen. How many different possibilities are there?
• What is the generalized R-Squared?
• Will you use a z table or a t table for computing the confidence interval for the slope?
• How do you find the z-score for which 80% of the distribution's area lies between -z and z?
• If a distribution has a mean of 266 and standard deviation of 16, what is the z-score of 282?
• What type of data warrants the use of an augmented Dickey-Fuller?
• You have created a (random) 5-digit password for your computer. A hacker tries to break in to your computer. What is the probability that he is successful on the first attempt?
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