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From a random sample we know that the average duration of unemployment in a low developed region A is 147 days (with standard deviation sA = 32 days and nA = 230 unemployed). Another random sample from a high developed region B reveals an average duration of unemployment of 96 days (with standard deviation sB = 43 days and nB = 180 unemployed). Is the duration of unemployment in region A significantly higher than in region B? Calculate also the p-value (p-Wert, empirisches Signifikanzniveau) of the test statistic.
Use a calculator or appropriate computer software to verify that, for the preceding data, xbar = 5.1.
In 1,000 samples, assuming that H 0 is true, how many times would you expect to commit Type I error if:
An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Find the 99% confidence interval for µ, the average annual salary ..
Hagger Engineering Corporation is considering undertaking several proposed projects for the next fiscal year. The projects, the number of engineers and the number of support personnel necessary for each project.
What statistical procedure was used to analyze data in study B?
Test whether there is difference in the two population mean. Use p-value approach
Find a 95% confidence interval for the mean µ of the population from which the men were selected.
In grading eggs into small, medium and large, Margi farms packs the eggs that weigh more than 4.25 ounces in packages marked " large" and the eggs that weigh less than 2.45 ounces in packages marked " small" the remainder are packed in packages ma..
The smallest defect in a computer chip will render the entire chip worthless. Therefore, tight quality control measures must be established to monitor the chips.
N=120, population standard deviation is (known) 5, alpha =.05, standard error of the mean (sigma of xbar)= .46, h0 is rejected if xbar
The histograms of some sampling distributions are symmetrical. T-F What would make a histogram symmetrical, and give an example of a symmetrical distribution? A random sample of size 36 is to be selected from a population that has a mean μ = 50 an..
Do these results suggest that the racial makeup of the faculty members is different from that of the students? (Use the .05 significance level.) Use the five steps of hypothesis testing and explain your findings.
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