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A sample of 81 observations is selected from a normal population with a standard deviation of 5. The sample mean is 40. Determine the 95% confidence interval for the population mean.
Convert each of the following z intervals to raw score x intervals:
Two types of flares are tested for their burning times (in minutes) and sample results are given below.
Describe what type of control chart you can use and how do you calculate the control limits (provide formula) to check if the calculate the control limits in this organization is in control.
f no more than 5% of the containers are to weigh less than 15.8 oz, what must the standard deviation of the weights equal?
Using the levels of significance given below: What is the rejection point at α = .10 and indicate if you would accept or reject H o ? t .10 =
The monthly cost of a long distance phone plan in dollars is a linear function of the total calling time in minutes. When graphed, the function gives a line with a slope of 0.11.
An entrepreneur in a developing country owns 10 food carts. He has ten employees to work with these food carts. Let Xi be a random variable representing revenue from cart i (on a particular day), i = 1,..., 10. Xi is approximately normally distrib..
Briefly explain the advantage of using an alpha level of 0.01 verus a level of .05. general, what is the disavantage of using a smaller alpha level?
The state wanted to see how three different math classes compared, so they gave a standardized test to all the students. Given the following results
Determine the mean annual amount spent on household consumption per family with a sample of 100 families, an average amount of $8,000 spent, and if the population standard deviation is $500,
Which of the following would be most helpful in assessing the practical significance of a test of hypotheses about a proportion?
Identify the sampling distribution to be used: the standard normal distribution or the Student's t distribution. Find the critical value(s).
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