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A production process assumes a population mean of µ = 80. Periodically this process is tested.
A Sample of n =100 is taken.
The standard deviation = 8
The firm has already decided that any sample mean below 78 or above 82 will signal the workers that the process is not working properly.
Using this information, calculate Blpha risk (probability of Type II error) if the true population mean really is 79.
The correct set of hypotheses to test the effect of the bonus plan, the difference between the t and z distributions
Test whether the music reduces studying capacity at a .05 level of significance.
The heights in centimeters of 5 students are: 165, 175, 176, 159, 170. The sample median and sample mean are respectively:
Determine the mean and the standard deviation of the sample.
Salary information for a random sample of male and female employees of a large company is shown below.
What IQ score should one have in order to be eligible for Mensa?
Real estate agents always say "location, location, location" is the most important thing in buying a house. We want to know if the sales prices of homes in two neighborhoods are similar. A random sample is taken from each neighborhood. The prices ..
Dating In Chances- Risks and Odds in Everyday Life, James Burke claims that about 70 percent of all single men would welcome a woman taking the initiative in asking for a date. A random sample of 20 single men was asked if they would welcome the woma..
A study of 40 bowlers showed that there average score was 186 the standard deviation of the population is 6. Find the 95% confidence interval of the mean score for all bowlers.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
What is the null and alternative hypothesis? What is your final conclusion?
Develop a 95% confidence interval of the difference between the daily population means for the two airports.
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