The aim of my investigation is to find out if the following hypothesis is true: Girls have a higher IQ than boys.

the spreadsheet of 30 boys and 30 girls.  First I will delete all the information I don’t need from the spreadsheet, the only information I will leave is the students number, gender, IQ score. All the other information is irrelevant. To get my sample I am going to use a calculator. I will press the 2ndf button then the number 7 then 0 and =. This will bring up a random nimbeer on the calculator e.g 0.233.  I will sort the data into two separate lists, one for boys and one for girls. I am goin to start at girl number 1. If for example my calculator brings up the number o.232 I will use the first number after the decimal place (2) and count up from the bottom e.g start at girl number one and move too places to girl 3. I will take number 3 at my sample . Then all I need to so is press = and the calculator will bring up another random number. If the calculator bring up 0.725 I will count up 7 places from number 3. My next sample would be number 10. I will repeat this 30 times to I have a sample of 30 girls. Then I will do the same and take a sample of 30 boys. I should have a sample of 60 students altogether. This way of taking samples is fair because all of the students  get a chance of being picked. I am taking equal amounts of boys and girls so I can compare them for my hypothesis. When I have collected all the data I need I will use it to work out the mean, mode, median and range. I need these calculations to compare and prove/disprove my hypothesis. I will also need to workout the inter quartile range for boys and girls IQ results and. I will use them to draw a box and whisker diagram for each so I can compare IQ scores. The mean will help me back up my inter quartile range because the mean is the same as quartile 2. I will need to draw a box and whisker diagram to compare the range between the boys and girls IQ scores. I will also draw a scatter graph so I can look at the correlation between scores. I will also draw a scatter diagram so in can look at the different scores. Sometimes I might come across problems. One of my samples could be a misprint e.g someone with an IQ of 14 is probably a mistake on the spreadsheet. If this problem occurs I will ignore the sample and carry on.