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1. Choo Choo Paper Company produces papers of various thicknesses. A random sample of 49 cuts had a mean thickness of 30.3 mils with a sample standard deviation of 4 mils.
a) Develop a 99% confidence interval for the mean thickness of the population.
b) Develop a 90% confidence interval for the mean thickness of the population.
2. A random sample of 121 checking accounts at a bank showed an average daily balance of $280. The standard deviation of the population is known to be $66. Construct a 95% confidence interval estimates for the mean.
3. Using the mean, standard deviation and confidence level from the previous question, how large a sample size would you need to use to achieve a margin of error of 7 dollars?
Let X1....X10 be a random sample from a population with mean 50 and standard deviation 4. Let X be the sample mean. Find the expected value and standard deviation of X. Do you know the probability distribution of X ? Clearly state any neces..
1. an art professor was interested in seeing what size group is best to prime the pump so to speak to encourage
The null hypothesis woud be rejected.
question 1 let x yz denote i.i.d. random variables with exp distribution for lambda gt 0. find px lt y zquestion 2
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The untreated population mean (those who did not receive the new teaching method) on the exam was p = 100. Using a two-tailed test and a = .05, test to see whether the scores on the math exam for those using the new teaching method was significant..
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State the Null Hypothesis, State the Alternatice Hypothesis and state the Level of significance - State the Test Statistic - Does the data indicate that the mean remission time using the new drug is different from 12.5 week at a level of significanc..
Develop 95% confidence intervals for the proportion of all students, the proportion of male students, and the proportion of female students who were involved in some type of cheating.
Decision Trees are graphic displays of the decision process. When do you feel it is appropriate to use decision trees?
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