Relationship Between Height and Weight of 7th Graders
Hypothesis
I chose to investigate the relationship between the height and weight
of year 7 students. I think that as the height increases, so will the
weight. This means there would be a positive correlation. I think that
the correlation coefficient will be between 0.5 and 1 because that is
strong positive correlation.
-1 0 1
[IMAGE]
negative no positive
correlation correlation correlation
Method
To investigate my hypothesis, I used given data from Mayfield High
School. It contained information such as name, age, height, weight,
IQ, eye colour, hair colour etc.
Using a computer, I opened the data using Microsoft Excel. As I was
only investigating height and weight of year 7 students, I deleted all
the irrelevant columns, such as year 8, 9, 10, 11 students, IQ, hair
colour, eye colour etc. I then sorted the data, again using the
computer.
I discarded my outliers in the data. I discarded data which either had
very tall or very heavy people on and this may be false data,
unreliable and affect my final result.
I needed a sample of 50 students and I had 200 year 7 students. To get
my sample of 50 students, I used systematic sampling. To get a sample
of 50 out of 200 I chose every 4th sample. I then copied and pasted
every 4th sample onto a new data sheet to get the samples I needed.
Again with the computer, I drew a scatter graph to show the
information of my sample. I calculated r and drew a regression line on
the graph.
I then printed out my scatter graph and my sample.
Calculating r
To show how r is calculated, I chose a small sample of 10 from my
sample of 50. To get my small sample of 10, I again used systematic
sample, and chose I every 5 samples. R is the correlation coefficient.
X
Y
X²
The size of the sample must be quite small, because it is stated so in
A sample of children ranging from 4 to 13 years old are going to be asked to watch a Rainbow Brite video. The children will be randomly picked from a childcare center. To ensure that the children are going to be randomly assigned, the children will range in different age groups. The first group will consist of 4, 6, and 8 year olds. The second group will consist of 10,12, and 14 year olds. It would have to be a field experiment because you have to go out and collect the data.
I will need to take a sample from the population, which is a list of
I graphed the fourteen schools using a scatterplot and decided to cut it down to
the error of the experimental ratio for the paper towels, which was 0.12. I took
as the “r-value” and “r” can be any value between -1 and +1. It can be
Distinguishing if a Relationship Exists or Can be Established between the Height and Weight of Students Ages 12-16
three results to work out my average as well as that it makes it a
I started by taking the 30 male pieces of data and 30 female pieces of
I think 1 in 3 children are obese because of various reasons. One is teens spend way too much time on their electronics each and every day and not enough time moving. Another is that there are food-related issues in our world. The final reason is parents and how their childhood, or social status. This is how 1 in 3 children are obese. These reasons are some of the main ones of how the obesity rate is so high in North Carolina.
It is unclear what type of method was used to select the sample and whether the sample was a simple random sample. The participants are the individuals of three different cohorts. One might assume that these three cohorts were randomly selecte...
Child hood years are year’s full of laughter, smiles and great memories. They are the days of finger paintings, games of hide and go seek, finger foods and juice boxes. But, did you ever think child hood would be the years of severe obesity leading up to major health risks and problems as an adult? “Today, about one in three American kids and teens is overweight or obese. The prevalence of obesity in children more than tripled from 1971 to 2011 (Overweight in Children).” Obesity among children, in the United States, has risen to be the number one health problem for parents. Obesity has even surpassed the problems with drug abuse and smoking.
Health has always been very important issue for everyone. Having a healthy lifestyle can allow people to live better lives. With today’s society children are exposed to more unhealthy diets by parents and schools. Having a balanced and good diet in children can decrease the risk of diseases caused by unhealthy nutrition in children. Obesity is a big issue because it can lead to many bad diseases like diabetes, cancer, and heart diseases that these children can develop by being obese. In addition the lack of physical activity by children is increasing the number of obese children in the united states. Obesity in children is caused by physical inactivity, overeating, and high diet of sugar and fats.
In order to be able to compare girls and boys in each year, I will
First of all, I would split the population of 20 students into two sample groups of 10 students, randomly assigning participants to their respective groups to allow group equivalence. To carry out this assignment I will use a simple random sampling technique; such as using a random number generator to generate 10 numbers, each number corresponding to a name on a list of participants in alphabetical order. These corresponding names will be the participants of sample group one.