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Why is it popular for advertisments to always state a confidence interval? Give an example of where you have seen this.
iq sores in a population are normally distributed with a mean of 100 and a standard deviation of 15. if a sample of
Show the sampling distribution of p and what is the probability the Times/CNN poll will provide a sample proportion
Not take SRS of 25 students who took test. What are the mean and standard deviation of sample mean score xbar of these 25 students?
The length of pregnancies are normally distributed with a mean of 268 days and standard deviation of 15 days. How many days do 80 percent of women last until in their birthing process?
eleven patients were weighed before and after a diet which was designed to help patients reduce weight. eight of these
a clinical trial is run to investigate the effectiveness of an experimental drug in reducing preterm delivery to a drug
The software manager estimates a value completed of $81,000. What are the cost and schedule variances and CSI. Estimate the time variance.
This sample has a mean weight of 5.03 Kg and a standard deviation of 0.21 Kg. Can we calculate that the mean weight produced by the machine has increased? Use 5% level of significance.
let x have a binomial distribution with parameters n and p and let the conditional distribution of y given x x be
sat i scores around the nation tend to have a mean scale score around 500 a standard deviation of about 100 points and
Do these results suggest that the racial makeup of the faculty members is different from that of the students? (Use the .05 significance level.) Use the five steps of hypothesis testing and explain your findings.
Let A be the event that a randomly chosen employee has a college degree and B the event that the chosen employee's income is more than $50,000.
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