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1. An antipollution device for cars is claimed to have an average effectiveness of exactly 546. Based on a test of 20 such devices you find that X‾ = 565.
2. Assuming normality and that σ = 40, would you rule out the claim with a Type I error probability of .05?
This essay explores the persuasive mode, one of the more common kinds of writing you'll experience throughout your college and professional career.
From past information, it is known that the standard deviation of the population is 22 mph. The 96.6% confidence interval for m is?
Has there been a significant shift upward in the percentage of persons who want to go to Europe? Using the .05 significance level for this study.
The number of stereos sold on each weekday. State the hypotheses and identify the claim, find the critical value(s), compute the test value, make the decision and summarize the results.
foreign affairs magazine conducted a survey to develop a profile of its subscribers foreign affairs website february 23
Find the 95% confidence interval for the true population mean. Identify the point estimate for mean and margin of error.
given the following information alternative hypothesis p lt 0.70 n 300 x 205 alpha 0.02. state your decision and
Zooms produces computer games. The quality control department of Zooms has a procedure to inspect its games. During the first hour of production the manager picks a random value between 1 and 60.
Describe the data for a correlational research study. Explain how correlational research is different from other research evaluating the relationship between two variables.
the lifetime of a semiconductor laser has a lognormal distribution and it is known that the mean and standard deviation
A metropolitan school system consists of three school districts-norths, south, central. The north district contains 25% of all students, the south district contains 40%, and the central district contains 35%.
Federal administration stated that unemployment level in US is 8.6% (population proportion = 0.086). A hypothesis test is to be performed to decide whether unemployment level in NY State differs from national level.
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