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A random sample size of n=66 is taken from a population mean =-12.5 and standard deviation of 6. What is the probability the sample mean falls between -12 and -13.
What is your conclusion based on both the p-value and critical-value approaches and what is the p- value, and what is your conclusion?
Suppose that X represents diameter measurements from a gamma distribution with a mean of 3 mm and a variance of 1.5 mm^2.
Find the percentage who receive As given that they attend class regularly.- The percentage who receive As given that they do not attend class regularly.
Averages versus individuals. Scores on the ACT college entrance examination vary Normally with mean µ = 18 and standard deviation s = 6.
What is a correlation coefficient? What do the size and sign of the correlation coefficient tell us about the relationship between variables?
Ppopulation with a mean of 240 and standard deviation of 18. Find the mean & standard deviation of sample distribution of the mean?
Given the following data from two independent samples, conduct a one-tailed hypothesis test to determine if the first sample mean is larger than the second sample mean, given a 0.05 level of significance.
The number of word errors has this distribution:- What are the mean number of nonword errors and the mean number of word errors in an essay?
A building contractor claims he can renovate a 300 square foot kitchen and dining room in 40 work hours plus or minus 5 hours (i.e. The mean and standard deviation respectively)
We can assign probabilities to values of using the normal density curve with mean 0.30 and standard deviation 0.023. Use this density curve to find the probabilities of the following events.
What is the forecast for year 13 based on the 5-year moving average? What is the forecast for year 13 based on the 5-year weighted moving average? What is the MAD for the moving average forecast
An airline wants to test the null hypothesis that 60 percent of its passengers object to smoking inside the plane. Explain under what conditions they would be committing a type I error and under what conditions they would be committing a type II e..
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