Kapitel 3

Question 1

What is the mode?

Answer 1

The most occured value.

Question 2

Explain weighted mean

Answer 2

Weighted mean är ett medelvärde där vissa värden har mer betydelse än andra.

Gångar värdet med vikten och delar på vikten.

Question 3

Explain range:

Answer 3

Range= largest value - smallest value

Question 4

Explain interquartile range:

Answer 4

Interquartile range= Third quartile - first quartile.

Question 5

Explain “variance”:

Answer 5

Är ett mått på hur mycket värderna i en datamängd varierar från medelvärdet.

Question 6

How do you compute “Coefficient of variation”?

Answer 6

Används för att jämföra hur stor standard avvikelsen är i förhållande till medelvärde.

Question 7

How do you count the coeficcient of variation?

Answer 7

Coefficient of variation= Standard deviation/ mean x 100

Question 8

If the skewness is -0,85 on a histogram, is it skewed to the left or right?

Answer 8

It is skewed to the left.

The tail is to the left

Question 9

If the skewness is 1,62 on a histogram, is it skewed to the left or right? Much och little?

Answer 9

It is highly skewed to the right.

Tail to the right.

Question 10

What is box plot a graphical version of?

Answer 10

The five number summary.

Question 11

How do you know if it is an outlier or not?

Answer 11

Start with interquartile range.

Q3-Q1=X

Then X multiplied by 1,5.

Then you add/sub that on the Q1 and Q3.

If the value is not between these numbers it is an oulier.