Average of the means
If a population has a standard deviation of 18, what is the minimum number of samples that need to be averaged in order to be 95% confident that the average of the means is within 2 of the true mean?
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For each of the following statements, give the null hypothesis (Ho), and the alternate hypothesis (H1).
A USA Today/Gallup Poll asked 1006 adult Americans how much it would bother them to stay in a room on the 13th floor of a hotel. Interestingly, 13% said it would bother them. The margin of error was 3 % points with 95% confidence. Which of the fol
A sports statistician would like to check this claim. Describe a method for obtaining a simple random sample of challenges during NFL games.
The weights of all candy bars of this type are certainly not constant because of slight variations in the factory production process. Assume these weights vary according to a normal distribution with mean \mu=2.2 and population standard deviation
Perform all of the steps of a two-tailed test of whether the population correlation is significantly different from zero. Use alpha = .01.
A trucking firm delivers appliances for a large retail operation. The packages (or crates) have a mean weight of 298 lb. and a variance of 2704. (Give your answers correct to four decimal places.)
A trucking firm delivers appliances for a large retail operation. The packages (or crates) have a mean weight of 305 lb. and a variance of 2916. (Give your answers correct to four decimal places.)
Five students performed a Kjeldahl nitrogen analysis of a protein sample. The following weight % nitrogen values were determined: 15.5, 13.7, 15.7, 15.4, 15.8. What is the value of Gcalculated for the Grubbs test? Should the outlier be rejected wi
In a simple random sample of 36 families in a certain country, you find that sample mean income to be $9,500 with a sample standard deviation of $2,500. Run a hypothesis test (?=.05) to test whether the population's mean exceeds $9,000. What is th
Given are five observations collected in a regression study on two variables.
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