Unit Test 3 and 4

• To compare and find correlation

• To show positive and negative correlation

• To show anomales

• For discrete and continuous data

• To make predictions

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

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

• 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

• 1 loaf = 75p
• 4 loaves = £3

• 5 pck = £50
• 3 pck = £30

• 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

ACTUAL CHANGE ÷ ORIGINAL X 100

• 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.