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A car manufacturer has redesigned the anti-theft device on one of its models to increase the time that it takes for a professional car thief to be able to steal the car. To determine the length of time that it takes it employs 30 reformed criminals to see how long it takes to steal the car. The sample has a mean time of 6 minutes and a standard deviation of 2 minutes.
i) Calculate a 95% confidence interval for the mean length of time it will take a car thief to steal the car.
ii) Calculate the size of the sample required so that the margin of error for the 95% confidence interval is 0.5.
A produce manager wants to estimate the mean size of coke bottle fills with 95 percent confidence. A preliminary sample of 12 bottles shows a sample standard deviation of 3 mil, and mean of 500.
Choose the proper conclusion regarding the claim that the population have different variances.
Suppose that beer consumption and religious affiliation are not independent of each other. That means that
prevent coronary artery vasoconstriction and the attendant reduction in blood flow to the heart and mechanical function.
The hypotheses for this scenario are as follows: Null Hypothesis: μ ≤ 21.61, Alternative Hypothesis: μ > 21.61. You perform a one sample mean hypothesis test on a random sample of data and observe a p-value of 0.0095. What is the appropriate concl..
Part 1. What is the appropriate distribution for such data? Part 2. Is this lot anomalous?
Explain how much money do these people make each year. Suppose you read in your local newspaper that 45 officials in student services whioch is earned as an average.
How many days should be considered if a 95 percent confidence is used and the estimate is to be within one hundred dollars?
What is the Chi-square test? Where can you apply it? Please site an example of how it was used and the outcome of the test. I think this could help me better than the book, it is difficult to understand.
Would the Kruskal-Wallis be an appropriate statistical procedure to test this Research Question (RQ)? Please explain your answer.
A coin is tossed 20 times. A person, who claims to have ESP is asked to predict the outcome of each flip in advance. She predicts correctly on 14 tosses.
Test the equality of the means of three populations.
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