1. Fill in the blanks so that the following command will display lines 201 to 205 of file b.txt.

   -205 b.txt | -5

2 points

QUESTION 5

1. Which of the following reveal relationship between two numerical variables? Choose all that apply.

   		bar plot
   		scatter plot
   		histogram
   		correlation

1 points

QUESTION 6

1. Which of following are to describe/visualize distribution of a numeric variable? Choose all that apply.

   		histogram
   		boxplot
   		bar plot
   		scatter plot

1 points

QUESTION 7

1. df is a pandas DataFrame with columns a, b, and c. What does df['a'].value_count() do?

1 points

QUESTION 8

1. The dataframe df is shown below:

   >>> df=pd.DataFrame({'a':[1,2,2,1], 'b':[9,9,8,9]})

   >>> df a b

   0 1 9

   1 2 9

   2 2 8

   3 1 9 

   The result of crosstab is shown below:

   >>> pd.crosstab(df.a, df.b) b 8 9 a 1 0 2 2 1 1 

   Which of the following explains the meaning of the highlighted/bolded value 2 in the crosstab output?

   		it is the row number of the output
   		it is the column number of the output
   		it is the number of rows in df with a=1 and b=9
   		it is the number of different combinations of the values of a and b