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For a sample of n=36 women, their mean pulse rate is 76 and the standard deviation of the individual data is SD = 12. Calculate the margin of error that would be used to determine a 95% confidence interval for the mean pulse rate of all women.
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The distribution of test scores is mui=35 and a standard deviation of 15. Do students taking the supplement have significantly better memory scores? Use a one-tailed t-test with an alpha=0.05.
Find the probability that 70 randomly selected washing machines will have a mean replacement time less than 9.1 years.
What is the probability that (a) the birthdays of twelve people will fall in twelve di?erent calendar months (assume equal probabilities for the twelve months).
Find the mean, median, mode, sample variance, and range. Do you think that this sample might have come from a normal population? Why or why not?
Let X equal the weight in grams of a 52-gram snack pack of candies. Assume that the distribution of X is N(μ, 4). A random sample of n = 10 observations of X yielded the following data:
A case-control study of relationship between liver cirrhosis among both non alcoholics and alcoholics. Describe whether smoking is confounder.
Length of smoking time was recorded for each. Mean was =140 hours. Suppose = 8 hours. Determine 95% confidence interval for mean amount of time grocery-store ham is smoked.
For a sample of 138 independent observations from a normal distribution of unknown μ and variance σ 2 = 2.6, the sample mean is 52.3. What is the width of the 95% confidence interval for μ?
A recent national survey found that high school students watched an average (mean) of 7.5 DVDs per month with a population standard deviation of .60.
Assume rf is 5% and rm is 10%. According to the SML and CAPM, an asset with a beta of -2.0 has a required return of negative 5%[=5-2(10-5)]. Can this be possoble?
Is this statistically significant evidence that the candidate has enough valid signatures overall? Explain.
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