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A population is normally distributed with a mean of -30 and a standard deviation of 5.
(a).What is the mean of the sampling distribution for this population? Explain
(b). If a sample of 16 participants is selected from this population, what is the standard error of the mean?
What is the difference between strong negative and strong positive correlation? What does zero correlation tell you? Can you share a relationship between two variables that is typically negative?
Benford's law Faked numbers in tax returns, invoices, or expense account claims often display patterns that aren't present in legitimate records.
Is there any evidence of a change in the performance of the lamps between the dates - If there is a difference, calculate the 95% confidence limits for the difference.
The morning arrival times for 10 days of a school bus at the Tipperary street pickup stop are 8:05, 8:06, 8:09, 8:12, 8:03, 8:15, 8:11, 8:16, 8:00, and 8:14.
A political telephone survey of 260 people asked whether they were in favor or not in favor of a proposed law. Each person was identified as Republican or Democrat. The following contingency table shows the results.
For the following data, verify that you do not reject with the ANOVA F testing with α = .05, but you do reject with Welch's test.- What might explain the discrepancy between the two methods?
Twenty students randomly assigned to an experimental group receive an instructional program; 30 in a second group do not. After 6 months, both groups are tested on their knowledge
Suppose the anxiety level of a patient selected from the study had a drop of 22.5 points. Which group is the patient more likely to have come from? Explain.
What is the sampling distribution of sample means? What is the mean of the sampling distribution of sample means?
Use Tinterval on your calculator (press Stat then tests to find the 95% confidence interval. What is the error bound?
To produce a consistent product, the variance in cream filling is carefully monitored. In a random sample of 23 cream puffs, the variance in filling was s2 = 0.
Using a separate 2 by 2 table, compute predictive value positive and predictive value negative for population of 1,000 drug users.
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