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The length of country and western songs is normally distributed and has a mean of of 170 seconds with a standard deviation of 49 seconds. find the probabality that a random collection of 16 songs will have a mean of 158.30 seconds or less?
Assume that cars are independent regarding to their paint quality. Each car has a 90% chance of passing the test. What is the probability that 3 of the next 6 cars will fail the test?
Is there evidence that the population mean amount is different from 8.17 ounces? (Use a 0.05 level of significance.)
Safe T cigarettes claim that their product has "low tar." Government standards are that this claim is invalid if there are more than 13.5mg tar per cigarette.
Nancy believes that the average running time of movies is equal to 140 minutes. A sample of 4 movies was taken and the following running times were obtained. Assume the population of the running times is normally distributed.
Clark Heter is an industrial engineer at Lyons Products. He would like to determine whether there are more units produced on the afternoon shift than on the day shift.
How does this probability compare to the probability that the word will be received correctly if we didn't use check bits, in which case all 4 bits would have to be received correctly for the word to be correct?
Inspect table produced in question 2 above. Comment on relative sensitivity of minimum sample size to actual proportion and to desired half width.
Which of the following would be a reason to choose a Moving Average Forecast model instead of a Naïve Model to forecast a series of data into the future?
Suppose the true population proportion is 68%. What is the probability of observing a sample proportion 64% or smaller.
The sample mean difference was 0.41 and Sd was 0.387.
If population standard deviation is σ = 8 is effect large adequate to be statistically significant? Use two - tailed effect with α = .05
Could you please explain in words how you figure out deciles, quartiles, kurtosis, skewness in Excel? How do you find the sum count, largest, and smallest in Excel?
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