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Assume that a simple random sample has been selected from a normally distribution population and test the given claim. Identify the null and alternative hypotheses, test statistic, p-value, critical value(s), and state the final conclusion that addresses the original claim.
Identify a research issue, problem, or opportunity that uses either interval or ratio level data (Recall that ratio level data are those data which have an absolute zero.
Fit a linear regression model for bp against sodium. Do you think this is a model with a good fit? Why?
question a food research laboratory conducts a series of taste tests to compare two sauce recipes a and b. customers
Please use the regression procedure within Excel under Tools > Data Analysis to construct this equation.
The director of a state agency believes that the average starting salary for clerical employees in the state is less than $30,000 per year. To test her hypothesis
the diameter of a brand of ping-pong ball is approximately normally distributed with a mean of 1.30 inches and a
the following data look at the association between group membership and whether or not the adolescent has had sexual
Use the average of 2001, 2002 and 2003 as the base and determine indexes for 2005 and for the preliminary 2006 data using 100 as the base value.
1) Twenty-five factory workers were asked how many vacation days they take a year. The average of the sample was 22.85 days, and the standard deviation was 5.80 days. In the past HR uses an average of 25 vacation days per worker in order to ..
a random sample of 70 needles was taken from a medical manufacturing facility and 24 were found to be defective.
For a sample of 11 independent observations from a normal distribution of unknown μ and unknown variance σ 2 , the sample mean is 74.6 and sample variance is 2.2. What is the lower point of the 90% confidence interval for μ?
in order to determine an interval for the mean of a population with unknown standard deviation a sample of 61 items is
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