Does children's shoe sizes get bigger as they get older?

Introduction:

I will be doing an experiment to investigate whether it is true or not that children's shoes sizes really increase as they get older. In order for me to prove this, I need to collect some data and to start with, I have to create a simple and short questionnaire and I will ask some of my friends and family who has children and could help me with this experiment by completing the questionnaire. My objective is to find out at the end of this investigation whether my experiment on children's shoe sizes is true or not true.

Aim:

The aim of the experiment is to find out if the children's shoe sizes get bigger as they get older. I want to know the relationship
I do some computations to get the average (mean, median, and mode), range and percentage.

After doing the computation to get the average shoe size of the children on each age. I expressed the results by using a more descriptive statistics such as bar chart, pie chart, line graph.

Based on the result of my computations, charts and graphs. After getting the average shoe size of the children on each age, it is clearly stated that the hypothesis is correct. It is indeed that the majority of the children, when they get older their shoes size also get bigger.

Please see next page for the computations of average (mean, median,mode) ,range, and percentage of the children's shoe size. And also on the next pages you will see the tables, graphs, and charts.
Discussion:

At the beginning of my experiment, it is a trial and error. I don't know how many participants do I need for my experiment. What materials do I need for this experiment? What age range of the participants do I need? On my first attempt, I tried 20 participants only. But I thought this was not enough to check my hypothesis. So I asked more friends and family to answer the questionnaire. I came up with a total of 60 participants, 30 boys participants and 30 girls participants. Their age ranges from 1 year old up to 10 years old. I collected 6 participants (3 boys and 3 girls) on each age.

After collecting the raw data, the next step I had done