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What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval? What percentage of times will the mean, or population proportion, not be found within the confidence interval?
about 200 words, no references
Suppose the manufacturers claim is right, determine the probability the mean of sample is 47,840 miles or less?
If Larry gets a 70 on a physics test where the mean is 65 and the standard deviation is 5.8, where does he stand in relation to his classmates?
The distribution of the height of students in a large class is roughly bell-shaped. The average height is 68 inches, and approximately 95% of the heights are between 62 and 74 inches. Thus, the standard deviation of the height distribution is appr..
A researcher administers a treatment to a sample of participants selected from a population with µ = 80. If the researcher obtains a sample mean of M = 88, which combination of factors is most likely to result in rejecting the null hypothesis?
Woodco manufactures tables and chairs. Each table and chair must be made entirely out of oak or entirely out of pine. A total of 150 board feet of oak and 210 board feet of pine are available.
A normal distribution with a mean of 55 and a standard deviation of 6 is evaluated to solve a business problem.
State the null hypothesis and the alternate hypothesis. State the decision regarding the null hypothesis.
After performing a two sample t-test, you see a p-value of 0.0355. Of the following, which is the appropriate conclusion?
The mean noise level for 24 hospital operating rooms was 56.3 dBA and the standard deviation was 7.5 dBA. At α = .05 can it be concluded that there is a difference in means?
Suppose the following table shows the number of colds 7 different people got during the typical cold season based on the number of times they washed they washed their hands per day during the cold season.
Is there a relationship between sales and newspaper?
Create the 90% confidence interval for mean score of all such subjects. You may suppose scores are usually distributed.
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