Question

Guys, please help me out! would love some explanations if possible. thanks very much

A nutritionist is looking at the connection between hours of TV watched and choice of sugary snacks in children identified as at risk for obesity. He asks children to document the number of hours of TV they watch and the number of sugary snacks they eat each day as shown in the first three columns of the following table.

In this table, fill in the missing values in the XY column, and then calculate ΣXY.

Child	Hours of TV Watched (X)	Number of Sugary Snacks Eaten (Y)	XY
A	3	3	9
B	1	3
C	2	1	2
D	4	2	8
E	5	4

ΣXY =42   

Fill in the missing values in the X² column of the following table, and then calculate ΣX².

Child	Hours of TV Watched (X)	Number of Sugary Snacks Eaten (Y)	X²
A	3	3	9
B	1	3	1
C	2	1
D	4	2	16
E	5	4

ΣX² =55   

Fill in the missing values in the Y – 1 column and the (Y – 1)² column of the following table, and then calculate

Σ(Y – 1)².

Child	Hours of TV Watched (X)	Number of Sugary Snacks Eaten (Y)	Y – 1	(Y – 1)²
A	3	3	2
B	1	3	2	4
C	2	1	0	0
D	4	2
E	5	4	3	9

Σ(Y – 1)² =   

At the end of the study, the nutritionist had a sample of 225 children aged 5 to 13 years. He estimates that there are 5 million children in this age group at risk for obesity in the United States.

Given this information, n =     

Answer 1