2_data_plot 실행시 ModuleNotFoundError: No module named 'sklearn' 에러

from sklearn.preprocessing import StandardScaler

std_scaler = StandardScaler()

scale_data = std_scaler.fit_transform(df_data)

scale_data

를 실행하면 아래 에러가 납니다.

ModuleNotFoundError Traceback (most recent call last)

in ()

----> 1 from sklearn.preprocessing import StandardScaler

2 std_scaler = StandardScaler()

3 scale_data = std_scaler.fit_transform(df_data)

4 scale_data

ModuleNotFoundError: No module named 'sklearn'

conda install StandardScaler 해도 안되구요.