Easy Data Scientist questions

34 questions · 5 points each for a correct first answer.

1. 1.Typical income in a skewed datasetdescriptive-statisticseasy
2. 2.Meaning of a p-valuehypothesis-testingeasy
3. 3.Ice cream and drowningcausal-thinkingeasy
4. 4.Counting orders per customersqleasy
5. 5.Customers with no orderssql, joinseasy
6. 6.Type I errorhypothesis-testingeasy
7. 7.Showing a distributiondata-visualisationeasy
8. 8.What standard deviation tells youdescriptive-statisticseasy
9. 9.Positive test for a rare diseaseprobability, bayes-theoremeasy
10. 10.Expected profit of a dice gameprobability, expected-valueeasy
11. 11.Probability of A or Bprobabilityeasy
12. 12.Values within two standard deviationsdistributionseasy
13. 13.Median of six numbersdescriptive-statisticseasy
14. 14.Z-score of an exam resultdescriptive-statisticseasy
15. 15.Units of variancedescriptive-statisticseasy
16. 16.Exactly two heads in three flipsprobability, binomial-distributioneasy
17. 17.Precision from a confusion matrixclassification-metricseasy
18. 18.Metric when missing a case is costlyclassification-metricseasy
19. 19.High accuracy on rare eventsclassification-metrics, class-imbalanceeasy
20. 20.Why keep a test setmodel-evaluationeasy
21. 21.High train score, low validation scoreoverfittingeasy
22. 22.Counting missing values in pandaspandas, missing-dataeasy
23. 23.pandas mean with a missing valuepandas, missing-dataeasy
24. 24.value_counts with normalizepandaseasy
25. 25.Filtering groups in SQLsqleasy
26. 26.COUNT of a column with NULLssql, missing-dataeasy
27. 27.Encoding a city columnfeature-engineeringeasy
28. 28.Scaling features for kNNfeature-scaling, knneasy
29. 29.Choosing the number of clustersclusteringeasy
30. 30.Chart for a monthly trenddata-visualisationeasy
31. 31.A correlation of -0.9correlationeasy
32. 32.Reading a regression coefficientlinear-regressioneasy
33. 33.Survey sent only to app userssampling, biaseasy
34. 34.What the central limit theorem saysstatistics, central-limit-theoremeasy