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The following sample was obtained from a population with unknown parameters.
Scores; 6,12,0,3,4.
a.) compute the sample mean and standard deviation. (Note that these are descriptive values that summarize the sample data.)
A sample of 64 observations is selected from a normal population. The sample mean is 215, and the sample standard deviation is 15. Conduct the following test of hypothesis using the .03 significance level.
The intensity level of an earthquake is based on the Richter scale. Using logarithms, the Richter scale measures an earthquake relative to (as a ratio of) the weakest possible tremor.
If the random sample of 16 men does result in a mean score of 590 is there strong evidence to support the claim that the course is actually effective? why or why not?
a study of 35 browns gerbils showed that their average weight was 4.7 ounces. the standard deviation of the population
Computing from a large sample, one finds the 95% confidence interval for 956; to be {6.8, 14.2}. Based on this information alone, determine the 90% confidence interval for 956
For which of given variables must a "two tail" t-test be applied?
Use frequency distribution to create a probability distribution, determine the (b) mean,(c) variance.
Find the regression line with all of these states removed from the calculation. Draw this new line on your plot. Was this group of states inuential?
Calculate the mean and the standard error of the sampling distribution of the sample means. Also, find the mean and standard error of the sampling distribution for samples of size 5.
Increasing confidence level will increase width of confidence interval. This is because the fact that increasing confidence interval will increase value of z(α/2), which will increase the size of standard error (z*s/√n).
Using the original data, estimate the population standard deviation with 90% probability.
Find the mean score, X , of the data in the frequency distribution above and find the standard deviation of the scores in the frequency distribution above.
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