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Find the left and right critical values from the appropriate table for a 95% confidence interval for the mean when the sample size is 23.
The sample data are summarized by the statistics n = 27, x = 4.6 years, s- 1.9 years.
The machine will stop working if more than three components fail. Find the probability that the machine will be working.
A professor is targeting a score of 80 on an exam. His forty-nine students averaged 78 on an exam with s = 7. Are the scores significantly less than 80 at a significance level of 0.05? Show your work and state the conclusion.
Determine relative frequency of X=4? Generate the cumulative frequencies.
A furniture store claims that a specially ordered product will take, on average, mean= 35 days (5 weeks) to arrive. The standard deviation of these waiting times is 5 days.
You just saw an ad on television that states the majority of the population would vote to make smoking illegal. The poll that is referenced shows 53% of those asked supported making smoking illegal.
Compute the suitable Test Statistic to test hypothesis that the proportion of condominiums that sold within 30 days decreased from 2006 to 2007.
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments. You are given the results below.
Recognize the kind of sampling (random, systematic, convenience, stratified, cluster) employed whenever a sample of people who smoke is obtained as explained below.
Determine the likelihood of accepting a lot which is 1% defective?
You take a random sample around town and calculate a p-value for your hypothesis test of 0.0913. What is the appropriate conclusion? Conclude at the 5% level of significance.
To report their finding they want to create a 90% confidence interval. What would be the margin error for this confidence interval?
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