# Let's say that a consumer group wants to estimate what the mean of the electric bill for the month of July is for a single family homes in a big city. According to studies conducted in other cities, the standard deviation is said to be twenty five dollars. The group wants to estimate, with a 99% confidence. The mean bill for July to within ±5.00, then what sample size is needed?

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.

Let's say that a consumer group wants to estimate what the mean of the electric bill for the month of July is for a single family homes in a big city. According to studies conducted in other cities, the standard deviation is said to be twenty five dollars. The group wants to estimate, with a 99% confidence. The mean bill for July to within ±5.00, then what

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