Thinking Skills: Critical Thinking and Problem Solving

6.2 Graphical methods of solution 235 6.2 Graphical methods of solution It can often be useful to draw a simple picture when try ...

236 Unit 6 Problem solving: further techniques Commentary A Venn diagram for this problem is shown below. The rectangle represen ...

6.2 Graphical methods of solution 237 easier to understand than the Venn diagram and the various subdivisions and sums may be mo ...

238 Unit 6 Problem solving: further techniques • In this unit we have seen how various diagrams may be used to represent and s ...

6.2 Graphical methods of solution 239 for^34 hour. Over a long period, what is the percentage of times they will coincide at the ...

240 Unit 6 Problem solving: further techniques 6.3 Probability, tree diagrams and decision trees decision trees 6.3 get the over ...

6.3 Probability, tree diagrams and decision trees 241 Commentary A way of solving this problem using a tree diagram is shown bel ...

242 Unit 6 Problem solving: further techniques This decision tree, like most real ones, has two types of branch. The first branc ...

6.3 Probability, tree diagrams and decision trees 243 In order to combine these, we calculate her expected average interest. Thi ...

244 Unit 6 Problem solving: further techniques take 20 minutes and 7 of them will take 40 minutes. The total time for these 10 j ...

6.3 Probability, tree diagrams and decision trees 245 4 Metco make components for small electrical equipment. One production ...

246 Unit 6 Problem solving: further techniques 6.4 Have you solved it? This chapter considers how you may check and be sure that ...

6.4 Have you solved it? 247 ensure that your method of searching is ‘cast-iron’ and will not produce an incorrect answer unless ...

248 Unit 6 Problem solving: further techniques 1 Chapter 3.2, question 2 (page 85) 2 Chapter 3.3, question 4 (page 89) 3 ...

7.1 Conditions and conditionals 249 Conditions are familiar in everyday life. Think about the expression ‘conditions of sale’ wh ...

250 Unit 7 Critical reasoning: Advanced Level tell us whether or not it is. To express necessary conditions you may need to empl ...

7.1 Conditions and conditionals 251 or [3c] Suppose we did nothing about climate change, this is what would happen. None of the ...

252 Unit 7 Critical reasoning: Advanced Level Commentary We’ll consider the two arguments in turn, starting with [5]. There are ...

7.1 Conditions and conditionals 253 B Possession of an ADQ and a clean licence are sufficient for approval. C Being 25 or over i ...

254 Unit 7 Critical reasoning: Advanced Level can apply to boats, buildings and so on, as well as to arguments. Likewise, ‘valid ...