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Probability using normal distribution. Sampling distributions. Given a normal distribution with μ = 50 and standard deviation σ = 9, if a sample of n = 100 is selected.
What is the probability that the mean is above 51.1?
If wages were increased by $1.00, what is the expected effect on the number of complaints received per employee? How can you tell?
A random sample of 15 paired observations has a correlation of -.46. Can we conclude that the correlation in the population is less than zero? Use the .05 significance level.
What is the chance that stock will fall by more than 15% next month? What extra assumption are you making when replying this question?
What is the null and alternative hypothesis? What is your final conclusion?
If campaign can be expected to also to rise the probability of best case scenario to 0.4, is it a good investment.
Assume the data for the three groups are independent and the data are approximately Normal. The P-value is less than 0.01. The correct conclusion is that
Compute a 95% confidence interval for the mean using the formula and where is the mean of the ten random numbers.
Explain why we need to use the t distribution. What assumption do you need to make?
Write introduction to STATISTICAL PROCESS CONTROL and Explain the use of SPC tools used at D2D
A researcher was interested in determining whether incentives affect the response rate in surveys. A simple random sample of 50 adult residents of a large city was selected. All were mailed a survey and promised a check upon returning a completed ..
Collapse the response categories in the following tables so that it meets the assumptions of the chi-square test; than perform the test.
He would like to determine whether there are more units produced on the afternoon shift than on the day shift.
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