Id Nikita Khrushchev survive Stalins purges of the mid-1930s because Stalin liked Khrushchevs level of brutality?

This coursework is a historical investigation for I.B. diploma
The sample format and guidelines will be attached as files;
and it would be favorable if some high level of vocabs would be included.
wide range of sources may be used such as autobiography, textbook, encyclopedia, video, official historical website and many more …