A mathematical model is a simplification which does not reflect all the aspects of the real problem. In the light of this comparison, the model is adjusted. This process is repeated. Chapter 2 Answers Exercise 2A 6 a 1. It is b

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A mathematical model is a simplification which does not reflect all the aspects of the real problem. In the light of this comparison, the model is adjusted. This process is repeated. Chapter 2 Answers Exercise 2A 6 a 1. It is b The mean is c It is quantitative because it is numerical. It is affected by the extreme value The hotel need not c 54 consider getting a new lift yet but should keep 2 Although c kg the means are the same, the d Key: 2 3 means 23 DVDs. Shop B has a b higher median.

Key: 1 3 means 13 bags. The interquartile ranges were about the same. If they switch, the probability of winning is 8 a 0. So they should switch. This answer assumes that b 0. They are cheaper and quicker than an experiment. They improve understanding of problems in the real world. They enable us to predict outcomes in the real world. The model is used to make predictions. Experimental data is collected. The model is refined. The median for A is less than the median for B.

A has outliers, but B does not. Both have positive skew. The interquartile range for A is less than the interquartile range for B.

The total range for A is greater than the total range for B. There is some reason to believe that, as breaking strength increases, hardness increases. As 4 a height increases, arm-span increases. If a student 3 There is strong positive correlation. As x increases, y increases. As s increases, t 4 0. There is no way in which one could be directly caused by the 6 a 9. The 7 This is not sensible. It is more likely that greater the age, the taller the person. There is suggest that students in the group negative correlation.

Sweet sales who are good at science are also actually decrease as newspaper sales increase. Mixed exercise 6E b 0.

As v increases, m increases. The further the taxi travels, the more it costs. Using the additive increases milk 3 a ii The yield c iii The yield of the last 3 cows is no greater than that of the 7th 5 a As engine size increases, the number of miles per gallon decreases. As age increases, blood pressure increases. This is reliable since 7 years is within the range of the data used. It is usually reasonably reliable. This is reliable since mm is within the range of the data.

Water vole A was probably left in the river since it is slightly overweight. Chapter 8 Answers Exercise 8A b 0. Number of heads h 0 1 2 b 1. The game depends on the skill of the b any discrete distribution where all the player. The points are likely to cluster probabilities are the same around the middle. Mixed exercise 9E 1 a 0. Linear coding does not affect the d 7. Diagram C corresponds to 0. It is easy to refine a statistical model. It could be drums or a double base. A marks are given for appropriately accurate correct answers.

A marks are not awarded without the method marks. B marks are given for correct answers. The easiest solution involves drawing a diagram to represent the 3 4 4 4 5 5 6 sample space. Each square is the sum of the scores on 2 3 3 3 4 4 5 the die. The first method mark is for attempting the 2 3 3 3 4 4 5 diagram and the second is an accuracy mark for all the values correct.

Then cancel the fraction. Remember to A1 subtract the square of the expectation. Try to First negative skew, given by whiskers, symmetric by box comment about location, spread and B1B1B1 Second positive skew. Make sure the regression c line passes through this point. M1A1A1 S hh Scc

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## A-Level Maths for Edexcel - Mechanics 1: Student Book (PDF)

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