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Scores for a civil service exam are normally distributed, with a standard deviation of 6.9. To be eligible for civil service employment, you must score in the top 5%. If the lowest score you can earn and still be eligible for employment is an 84, what is the mean score for the exam? Round your answer to the nearest tenth.
Make up a scatter diagram with 10 dots for each of the following situations:
What is the purpose of a post-hoc test with analysis of variance? What is probabilistic equivalence? Why is it important?
A random sample of 36 days yielded the average daily output of 890.2 tons, with standard deviation of 19.8 tons. Use this information to make a 95% confidence interval for mean.
What is the relationship between the variance and the standard deviation?
Note that Σ x = 2233 and Σ x 2 = 138,053. At the 5% level of significance, can the instructor conclude that the new mean is different from 64?
Roberta scored in the 85th percentile on a standardized test of reading ability. What is Roberta's associated z score?
Calculate the mean and standard deviation of the sample mean based on data from 100 stores.
Determine a 95% confidence interval for the population mean.
At the .05 significance level, can we conclude that the guideline is still reasonable?
What is the null hypothesis? Use α =0.05. Compute critical value. Use α =0.05.
Graph a relative frequency histogram for the 500 measurements summarized in the accompanying relative frequency table.
Choosing the appropriate the sampling design for the given data
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