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Dr. Jefferson wants to know if the IQ of a group of hobos is bette than the IQ of a group of heroin abusers. The hobos had a mean IQ of 95, SD = 3. The mean IQ for the heroin abusers was 82, SD = 4.
Conduct necessary analyses using so you can answer the questions - Submit your responses to the exercise questions as a Word document.
A sample of 8 applications are randomly taken and these were processed in 7, 6, 7, 9, 3, 3, 8 and 5 days. Assuming that the processing time is normally distributed, test the validity of the officer's claim at 0.01 level of significance.
Does this mean that 5% of all results reported in the research literature are, in fact, Type I errors rather than real effects of the independent variables?
Standard deviation of 0.04135 (4.135%). Treating the next 12 months as a random sample, what is the probability that the mean rate of return will be positive?
A manager at a local manufacturing company has been monitoring the output of one of the machines used to manufacture small aluminum plates.
Compare the two sets and describe what you discover. The following data sets shows the ages of the first seven presidents (President Washington through President Jackson) and the seven most recent presidents including President Obama. Age is given..
A legislative aide is doing research on the duration of calls initiated on car cellular phones. A preliminary study showed that the standard deviation of these calls is 1.6 minutes.
Computing the Z scores for the given data and evaluate µ and σ for the population.
Given: You are using a significance level of α = 0.05 to test a claim that p > 0.5. Your sample is a simple random sample of size n = 49. Calculate β for the test, assuming that the true population proportion is 0.7 and showing all work.
The mean assembly time for a random sample of 24 carts, using the new method, was 40.6 minutes, and the standard deviation of the sample was 2.7 minutes.
the weight of an organ in adult males has a bell-shaped distribution with a mean of 330grams and a standard deviation
A local grocery store wants to estimate the mean daily number of gallons of milk sold to customers. Assume the number of gallons sold follows the normal distribution with a population standard deviation of 5.10 gallons.
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