







Number of Students Presently Enrolled
 Year 8  Year 9  Year 10  Year 11  Year 12  Total 
Boys  98  95  95  76  65  429 
Girls  96  84  82  72  57  391 
Total  194  179  177  148  122  820 
Question 1.
There are a number of sampling techniques you could use  random, accessibility, systematic, quota, judgemental, stratified, cluster or capturerecapture. Which technique (or combination of technique) would you use? Justify your choice by outlining the strengths of the technique(s) you chose and the weaknesses of at least three of the rejected techniques.
Question 2.
Suppose you decide to survey 100 students using a stratified sampling technique
a) How many year 8 boys would you survey? Show how you calculate this number.
Year Level  Number of Students  Number in Sample 
Year 8Boys  98  98/820 ×100 = 11.95 i.e 12 
In a survey of year 8 boys with a population of 98, there would be 23 students surveyed.
b) Complete the table below showing the numbers of students (by gender and year level) you would include in your survey.
 Year 8  Year 9  Year 10  Year 11  Year 12  Total 
Boys  12  12  12  9  8  53 
Girls  12  10  10  9  7  48 
Total  24  22  22  18  15  101 
Question 3
Suppose you calculated that you needed to include seven year 12 girls in your survey. You identify each girl by number from one to fiftyseven. If you use the last two digits of the numbers in the threedigit random number table on page 174 of your text book, starting in the bottom left hand corner and going up and down from left to right, which numbered girls would you include in your survey?
The numbered girls that would be included in the survey would be 51, 35, 57, 52, 14, 4 and 19.
Question 4
Available shirt sizes are 28, 30, 32, 34, 36, 38, 40, 42 and 44. You conduct your survey of 100 students to determine what size shirt they wear and obtain the...