money and 0 for the plain paper), and then compute the correlation. ∑X ∑Y ∑XY SSXX SSYY SP r Square the value of the point-biserial correlation to obtain r². r² = An independent-samples t test for the difference between the means of the two groups produced t = 3.573 with df = 16. Use the equation you learned for r² in connection with t tests to obtain r² directly from the t statistic and its df. r² =
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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Counting Money
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Counting Paper
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| 7 | 9 |
| 8 | 11 |
| 10 | 13 |
| 6 | 10 |
| 8 | 11 |
| 5 | 9 |
| 7 | 15 |
| 12 | 14 |
| 5 | 10 |
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∑X
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∑Y
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∑XY
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SSXX
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SSYY
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SP
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r
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