Question

I need to decide the class width and the class interval for this data. I'm a little confused =/

Answer 1

I have to assume that the top row of numbers is your first class and the bottom row is the second class. Would that be a correct assumption?

Answer 2

Because there are two ways to look at class width. Classes with continuous distribution and classes not joined continuously. Right?

Answer 3

For continuous distribution just subtract the lower limit from the upper limit to determine class width. For non continuous distribution subtract the lower limit of class 1 from the lower limit of class 2 OR the upper limit of class 1 from the upper limit of class 2.

Answer 4

Please I need some feedback on this because it has been quite some time since I took stats and I don't know if I'm getting my terms mixed up.

Answer 5

No, they are just raw data.

Answer 6

I'm asked to decide the number of classes.

Answer 7

and the class width.

Answer 8

In this case I have classes with continuos distribution.

Answer 9

There is some kind of rule that states that I can choose the number of classes k. In such a way that k is the lowest number that satisfies this equation. \[2^k=n\] where n is the number of observations.

Answer 10

Sorry, it's \[2^k>n\]

Answer 11

I chose k = 5 because \[2^5=32 > 16\]

Answer 12

Then I got the range and divide it by the number of classes to get the class width in this way. \[i=\frac{31-25}{5}=\frac{6}{5}\approx1.5\]

Answer 13

I'm not sure about havind a class width as a decimal number =/

Answer 14

I think you can but since you can choose the number of classes arbitrarily, I think most people choose a number that divides evenly.

Answer 15

Mmm ok. then I'll leave it as it is.

Answer 16

Thak you jagatuba =)

Answer 17

No problem. I wish I was better at stats. lol

Answer 18

Me too haha but I'm working to beat it.