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Suppose the average Math SAT score for all students taking the exam this year is 480 with standard deviation 100. Assume the distribution of scores is normal. A SRS of four students is selected and given special training to prepare for the Math SAT. The mean Math SAT score of these students is found to be 560, 80 points higher than the national average. We may correctly conclude
A. the results are neither statistically significant at level = 0.05 nor practically significant.
B. the results are not statistically significant at level = 0.05, but they are practically significant.
C. the results are statistically significant at level = 0.05, but they are not practically significant.
if the random variable z is the standard normal score is it true that pz lt 0 could easily be determined without
A point Y is selected at random from interval (0,1). Then another point X is chosen at random from the interval (0,Y). Find probability density function for X.
Assuming a normal distribution, What is the z-score associated with the second quartile? If we wish to have 95% confidence interval, what would be the value of the confidence coefficient?
provide me half page response to each discussion post. for the discussion 1 and discussion 2 tell me what you liked
What parametric test could be used to test for the effect of linoleic acid on SBP? Perform the test in Problem 1, and report a p-value. What nonparametric test could be used to test for the effect of linoleic acid on SBP?
You want to test the hypothesis that the mean age for teachers is equal to 50. If you take a sample of 64 observations and find a sample mean of 49
the alphacor company experiences some type of failure on its computer network on average once every 4 hours. assume
Construct a 98 percent confidence interval estimate of the difference between the two sample means (Please show work).
The amounts of money requested on home loan applications at Down River Federal Savings follow the normal distribution, with a mean of $70,000 and a standard deviation of $20,000.
Explain the differences between qualitative and judgmental statistical time-series, and explanatory/causal forecasting models.
The undergraduate grade point average (GPA) for students admitted to the top graduate business schools was 3.37 (Best Graduate Schools, U.S. News and World Report, 2001).
how many times should a coin be tossed to obtain a probability of equal to or greater than 0.9 of observing at least
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