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To determine the efficiency of a batch of production of electric motors 8 are tested. The average efficiency of a sample is calculated to be 88.5% and the standard deviation of the sample is 0.5%. Determine a 95% confidence interval for the mean efficiency of a given batch of motors. If we want to cut the confidence interval by 1/3, how many motors should be tested?
In this table, my research is about the average amount of money people expect to spend on attomeys when they are injured. Is there a difference, depending on type of injury? Do people expect to spend more when the injury happened in a car, on job,..
Western residents reported that they were completely satisfied with their local telephone service. Find the 95% confidence interval for the difference in two proportions.
What is the 95% confidence interval for the proportion of smokers in the population (to 4 decimals)?
Using this information, calculate Beta risk (probability of Type II error) if the true population mean really is 77.
Who are also athletes but who are not regularly hit in the heads. Is this an example of an experimental or a non-experimental study? Why?
What does a squared correlation coefficient represent? Also, does the strength of the correlation depend on the direction? Finally, does correlation imply causation.
Find out a 95 percent confidence interval for population mean.
The sample yielded a mean content of 19.88 ounces with a standard deviation of 0.35 ounces. At 95% confidence using the p-value approach, test the hypothesis.
Construct a 95 percent confidence interval for the population mean. Is it reasonable that the population mean is 28 weeks? Justify your answer.
Is there a relationship between sales and newspaper advertising? Support your answer?
How does a t test differ from a z test in terms of when it is used, how it is calculated, and how we determine significance?
Data in table represent number of consumer complaints against major U.S. airlines. If one complaint from table is arbitrarily chosen, determine the probability that it was filed against United Airlines.
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