In 2003, the Kimberly Certification Process was implemented for participating countries in an effort to stop the trade in "conflict diamonds" and ensure diamond purchases were not financing violence by rebel movements. The information below represents the amount of production (in cubic tonnes) before and after the certification scheme was implemented for five participating countries. Country Before 2003 After 2003 Sierra Leone 450 440 Guinea 390 380 Ghana 335 330 Central African 305 300 Republic Republic of Congo 375 380 A hypothesis test is conducted using a 5% significance level to determine whether there is evidence to suggest that the certificationscheme was effective in reducing the amount of diamonds produced. What is the standard deviation of differences between the paired observations?

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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.