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Critically illustrate out the characteristics of a standard normal distribution? Can two distributions with the same mean and different standard distributions be considered normal? How might you determine if a distribution is normal from its graphical representation?
Give critical test statistic and compute sample test statistic. Test null hypothesis at alpha level .01.
Given that consumer changed te brands, what is the probability that consumer purchased fewer products than before?
What is sampling with replacement, and why it is used?
Construct a 90% two-sided confidence interval onthe difference between the proportion nonconforming in processes 1 and 2. Based on this confidence interval, can you conclude at a significance level of 10% that the difference is not equal to 10%? W..
What's the expected value of sample information? How much might the physicians be willing to pay for a market study?
For a sample of 138 independent observations from a normal distribution of unknown μ and variance σ 2 = 2.6, the sample mean is 52.3. What is the width of the 95% confidence interval for μ?
Using the original data, estimate the population standard deviation with 90% probability.
This distribution is positively skewed. The standard deviation of the population is not known.
The mean salary of the nine employees of a small business is $52,000 per year. One employee, whose salary was $68,000, was red. Two new employees, who will each be paid a salary of $40,000, are hired. What is the new mean annual salary of the emp..
Test for significant differences among weight losses for the five diets, and perform all pair wise comparisons using:
A company is interested in estimating μ, mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee.
Given that standard deviation process=4.7 and standard deviation gage=3.4, what is the total standard deviation in data from this process?
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