Unit Test 3 and 4

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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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