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According to Gallup, about 33% of Americans polled said they frequently experience stress in their daily lives. Suppose you are in a class of 45 students. If 20 students in the class said they frequently experience stress in their daily lives, would you be surprised? Explain and use statistics to support your answer.
The IQ scores of 30 children from under-privileged households, were measured before and a year after, a program of nutritional supplementation was instigated at a primary school.
Using one mean t test to determine whether or not to support the claim - hypothesis test that WORKS THE SAME as the z-test
A sample of charge accounts at a local drug store revealed the following frequency distribution of unpaid balances. Determine the standard deviation. Compute the coefficient of variation.
Explain the difference between a left-tailed, two-tailed, and right-tailed test. When would we choose a two-tailed test? How can we tell the direction of the test by looking at a pair of hypothesis?
How large should n be so that a 90% confidence interval for µ has a margin of error and What is the P-value for a test of the hypotheses
Also, 77 percent of managers have MBA degrees. Using probability formulas, determine proportion of employees who either have MBAs or are managers.
If you have a population that has a small sample, but does not meet all of the criteria for the nonparametric test how can you tell what test to use?
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
Contruct a confidence interval for the proportion of non-fatal accidents that involved a cell phone at a 95% confidence interval.
For all questions, clearly explain/show your answers. For the Analysis section, justify your answers with the appropriate graphs, statistics, equations, etc.
You've two separate sets of data. From one set you calculate the standard error to be 500. From the other set, the standard error was 5.
What is the 95% confidence interval for the difference between the mean prices of the two models?
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