# Unit Test 3 and 4

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• Created by: poppylown
• Created on: 17-01-16 18:42

## Scatter Graphs

• To compare and find correlation
• To show positive and negative correlation
• To show anomales
• For discrete and continuous data
• To make predictions
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## Time-Series Graphs

• To show changes in patterns over time
• Shows trends
• Moving average
• Used for continuous and discrete data
• Seasonal variation
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## Frequency Polygons

• To show the most popular result
• To show the popularity/frequency of result
• Track progress
• Continuous data
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## Interest

• Simple Interest: a set amount added on
• Interest = Starting amount of money x Interest rate per year (decimal) x Time the money is invested
• Compound Interest: amount changes depending on how much you earnt on top of that
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## Direct Proportion

• 1 loaf = 75p
• 4 loaves = £3
• 5 pck = £50
• 3 pck = £30
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## Ratio

• Ratio: relationship between two numbers indicating how many times the first number contains the second. For example, if a bowl of fruit contains eight oranges and six lemons, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3).
• 1:12 = 2:24 = 3:36 = 4:48 = 5:60
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## Percentage Increase/Decrease

ACTUAL CHANGE ÷ ORIGINAL X 100

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## Dividing and Multiplying Fractions

• To divide: turn the fraction upside down and multiply. It works with all fractions. For example dividing by 2/3 is the same as multiplying by 3/2. Notice that when you divide by a fraction the answer is larger than the number you started with.
• To multiply: Simplify the fractions if not in lowest terms. Multiply the numerators of the fractions to get the new numerator. Multiply the denominators of the fractions to get the new denominator.
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