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Manufacturing and Product Development Pig iron is a mixture of iron ore, charcoal from coal, and limestone, melted together under very high pressure. This type of iron is usually refined and used to produce wrought iron, cast iron, or steel. A random sample of the production and shipment of pig iron (in 100 metric tonnes) per month in Canada was recorded.
Use the four methods presented in this section to determine whether there is any evidence to suggest the data are from a non-normal population.
A group of items of data have been found to be normally distributed with a mean of 80 and a standard deviation of 6. Please convert 80 to a z-score and show the calculation.
spare servers are maintained in stock to support it operations. a study determined that on average there are four
A research study will measure the cost of the new method over a sample production period. Develop the null and alternative hypothesis most appropriate for this study.
the standard normal table shows an area value of 0.8 for a z-score of 0.84. what percentage of the observations of a
Suppose that in fact 8% of the apples on the truck do not meet the standards. What is the probability that the shipment will be accepted anyway?
The mean annual salary paid to all employees in a company was EURO 30.000. The mean annual salaries paid to male and female employees of the company were EURO 32.000, and 24.000, respectively. Determine the percentage of males and females employed..
The Secretary of Welfare hypothesizes that the average district office has 5% or fewer fraudulent or ineligible recipients. A sample of 10 offices reveals a mean of 4.7% with a standard deviation of 1.2%. What can be said about the secretarys hypo..
Which of the z-scores below is the smallest one that leads to rejection of the null hypothesis - Identify the population to which the results of the test apply.
Use the 0.10 level in helping Egbert determine whether the modifications are really effective in improving his racer's speed. Using the appropriate statistical table, what is the approximate p-value for this test?
Of course, many different kinds of plastic exist. Spend 10 minutes writing down pos- sible ways to recycle one-gallon plastic milk jugs. You can assume that the milk jugs are received rinsed out and reasonably clean, but not sterile. Look at your ..
If the rods' lengths produced by your line are normally distributed, with a mean equal to the target of 0.2 meters, and a standard deviation of 0.015m, what percentage of rods will be scrapped?
The time it takes a student to finish a electronics test has a uniform distribution between 50 and 70 minutes.
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