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The following data are from two separate samples. Does it appear that these two samples came from the same population or from two different populations? Use an F max test to determine whether there is evidence for a significant difference between the two population variances. Use the 0.05 level of significance.
Use an independent measures t test to determine whether there is evidence for a significant difference between the two population means. Use alpha = 0.05.
sample 1 sample 2
n=10 n=10
M=32 M=18
SS=890 SS=550
We monitor the number of incoming calls into a doctor's office. Let X be the number of incoming calls between the hours of l pm and 2 pm and Y be the number of calls between l pm and 3 pm.
Explain in words general pattern of correlation is statistically important.
Find a 90% confidence interval for the population mean weight of all such turtles.
Assume that you want to use a 0.05 significance level to test the claim that paired sample data come from a population for which the mean difference is Ud = 0. Find (a) d-, (b) Sd, (c) the t test statistic, and the critical values.
The manufacturer of the ColorSmart-5000 television set claims that 95 percent of its sets last at least five years without needing a single repair.
Let A be the event that a student is enrolled in an accounting course, and let S be the event that a student is enrolled in a statistics course.
Give a real world example of a situation where normal parametric tests would not be useful and where there is a need for nonparametric test methods. Be specific and explain why nonparametric tests are needed in that case.
Suppose that an IQ test was given to a large group of persons, the scores are assumed to be from a normally distributed population, that mean = 100 and s (standard deviation) = 15.
12 mature citrus trees of one variety and 15 of another gave means and standard deviations of their heights as 13.8 and 12.9 ft (means), and 1.2 and 1.5 ft (standard deviations).
a) Test whether there is a difference between attitudes in the 2 cities. Use a 95% alpha. b) What does your result say about attitude consistency across cities?
In this continuous production process, the amount of toothpaste put in a tube is normally distributed with a mean of 8.17 ounces and a standard deviation of 0.12 ounces. If the actual capacity of the tubes used is 8.49 ounces, what proportion of t..
One thing you have learned is that the tangency portfolio will give you the maximum Sharpe ratio. Consequently, you have constructed such a portfolio. What are you portfolio weights.
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