Unbiased Data Collection and Analysis

1. Unit 15Data Collection Biased Questions

2. Rewrite these questions so as to make each of them unbiased. • Do you think that we do enough work in school and that homework is unnecessary? • Should the Government spend more money on education? • Should the Prime Minister avoid paying income tax? • Should nurses get a bigger pay rise that politicians? • Should there be more sport on TV? • Should we still belong to the Commonwealth? • Do you agree that Arsenal are clearly the best football team in the world? • Should we abandon our Jamaican dollar and adopt the US dollar for our currency?

3. Unit 15Data Collection Survey Results

4. Lance thinks that students who come to school by bus are more likely to be late that those who do not travel by bus. In order to test whether or not this is true, he carries out a survey of 100 students from Grade 7 for 5 consecutive Tuesdays. Do the results show Lance is correct? How could the survey be improved?

5. ? ? ? Lance thinks that students who come to school by bus are more likely to be late that those who do not travel by bus. In order to test whether or not this is true, he carries out a survey of 100 students from Grade 7 for 5 consecutive Tuesdays. c) A student is selected at random from Grade 7 What is the probability that this student walk to school on Tuesday?

6. Unit 15Data Collection Sampling

7. Mrs Clarke Mr Gordon Mr Wright Mr Lawrence There are 12 teacher is a small school. A sample size of 4 is to be selected from this population. A ) SYSTEMATIC sample Here we collect, for example, every third teacher from the sample, giving:

8. 02 Mrs Grant 11 Mr Davis 05 The third number is and the teacher is The fourth number is and the teacher is Mrs Miller 03 Mrs Clarke B ) RANDOM sample Here we need to use a list of random numbers. Beginning at the top left hand corner and working down the column, you take pairs of numbers using only numbers less than 12. The first number is and the teacher is The second number is and the teacher is

9. Unit 15Data Collection Distance Chart

10. 89 km 90 km Black River Hectors River and • What is the distance from: • Lucea to Rio Bueno? • Hectors River to Spanish Town? • Which two places are furthest apart?

11. 140 62 112 314 + + = km c) You drive from Spanish Town to Montego Bay to Black River and back to Spanish Town. What distance do you travel?

12. Unit 15Data Collection Favourite Sports

13. 7 6 10 How many students choose Basketball in Grade 8? How many more choose Football in Grade 7 than is Grade 10? In which Grade was Football not the most popular sport?

14. Unit 15Data Collection Pictograns

15. 50 35 35 30 50 25 50 65 255 + + + + + = How many customers used the shop on Wednesday? How many customers used the shop on Monday? How many customers used the shop during the week?

16. Unit 15Data Collection Bar Charts

17. 60 45 15 - = 22 45 58 35 60 220 + + + + = ? ? ? ? ? The table below shows the number of chocolates sold in a school canteen during one week. How many more chocolates were sold on Friday than on Tuesday? What was the total number sold through the week? What was the mean number of chocolates sold daily? What is the probability that, on a random day, fewer than 50 chocolates were sold? ?

18. The table below shows the number of chocolates sold in a school canteen during one week. Complete the bar chart to represent the information above.