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Use the given date to find the minimum sample size required to estimate a population proportion and populat mean. Margin of error: 0.004, confidence level, 90%, sample proportion (p) : = 0.45
In a shipment of 59 vials, only 18 does not have hairline cracks. 6 vials are randomly selected from the shipment. Find the probability that at least one of the 6 selected vials has a hairline crack.
Families in the USA have a monthly magazine that discusses issues related to health and health costs. After surveying 23 of their subscribers
Why do so many of life's events share the same characteristics as the central limit theorem? Why are estimations and confidence intervals important? When might systematic sampling be biased?
At the 0.01 significance level can we conclude that there is a higher proportion of absenteeism among afternoon employees? Compute the value of the test statistic.
The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A sample of 20 chickens shows they laid an average of 20 eggs per month with a standard deviation of 2 eggs per month.
What is the point estimate of the students mean salary? What is the point estimate of the standard deviation of the students salaries? Construct a 95% confidence interval for the mean salary of the DM students?
What is a one-tailed test? What is a two-tailed test? Explain at least three differences between one- and two-tailed tests. State a hypothesis related to this study that would cause you to conduct a one-tailed test. State a hypothesis related to th..
Calculate the sample correlation coefficient by hand. By use of a spreadsheet calculate the sample correlation coefficient.
The sample mean life is 5.5 years with a standard deviation of 0.6 years. If you were constructing a 99% two-sided confidence interval estimate, the lower limit would be?
Given the variances of the two samples below, find the test value and the degrees of freedom that should be used in an F test.
How large a sample must one take to be 90% confident that the estimate is within 0.05 of the true proportion of women over 55 who are widows?
Repetitions of numbers are not permitted, i.e., the same number cannot be used more than once in a total sequence. As examples, 27, 94 or 55 would not be permitted. How many different code groups can be designed?
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