In a production process of metal sticks, the length of these metal sticks is distributed normal with standard deviation of 1.8 millimeter. A random sample of 9 metal sticks are chosen and 99 percent confidence interval is computed with lower and upper bounds of 194.65 and 197.75. The production engineer finds that these bounds are not useful. Instead he wants that these bounds should be 0.50 millimeter larger and less on both sides of the mean with 99 percent confidence interval. Compute the necessary sample size for engineer’s specification.
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
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