DA0-001 Practice Test

DA0-001 Practice Test practice questions, page 7 of 17, with answer review and explanations.

Question 31

An analyst has generated a report that includes the number of months in the first two quarters of 2019 when sales exceeded $50,000: Which of the following functions did the analyst use to generate the data in the Sales_indicator column?

  1. Aggregate
  2. Logical
  3. Date
  4. Sort

Question 32

While reviewing survey data, an analyst notices respondents entered “Jan,” “January,” and “01” as responses for the month of January. Which of the following steps should be taken to ensure data consistency?

  1. Delete any of the responses that do not have “January” written out.
  2. Replace any of the responses that have “01”.
  3. Filter on any of the responses that do not say “January” and update them to “January”.
  4. Sort any of the responses that say “Jan” and update them to “01”.

Question 33

Which of the following data cleansing issues will be fixed when a DISTINCT function is applied?

  1. Missing data
  2. Duplicate data
  3. Redundant data
  4. Invalid data

Question 34

A county in Illinois is conducting a survey to determine the mean annual income per household. The county is 427sq mi (2.65q km). Which of the following sampling methods would MOST likely result in a representative sample?

  1. A stratified phone survey of 100 people that is conducted between 2:00 p.m. and 3:00 p.m.
  2. A systematic survey that is sent to 100 single-family homes in the county
  3. Surveys sent to ten randomly selected homes within 5mi (8km) of the county’s office
  4. Surveys sent to 100 randomly selected homes that are reflective of the population

Question 35

Which of the following statistical methods requires two or more categorical variables?

  1. Simple linear regression
  2. Chi-squared test
  3. Z-test
  4. Two-sample t-test