All Free Statistics MCQs with Answers
Every Statistics question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
545 questions · page 21 of 55
201. Which branch of statistics deals with the techniques that are used to organize, summarize, and present the data?
- A. Advanced Statistics
- B. Probability Statistics
- C. Inferential Statistics
- D. Descriptive Statistics
- E. Bayesian Statistics
Explanation: Descriptive statistics organizes, summarizes, and presents observed data using tables, graphs, and numerical measures. Inferential statistics instead uses sample data to draw conclusions about a population.
Correct answer: Descriptive Statistics202. Data in the Population Census Report is____________?
- A. Grouped data
- B. Ungrouped data
- C. Secondary data
- D. Primary data
- E. Arrayed data
Explanation: Census information is collected firsthand by surveying every unit of the population, so it is classified as primary data. It may become a secondary source for someone who later uses the published report, but the census data itself is primary.
Correct answer: Primary data203. In descriptive statistics, we study______________?
- A. The description of decision making process
- B. The methods for organizing, displaying, and describing data
- C. How to describe the probability distribution
- D. None of the above
Explanation: Descriptive statistics organizes, presents, and summarizes observed data using methods such as tables, graphs, averages, and measures of variation. Decision-making about a population belongs mainly to inferential statistics.
Correct answer: The methods for organizing, displaying, and describing data204. A constant variable can take values______________?
- A. Zero
- B. Fixed
- C. Not fixed
- D. Nothing
Explanation: A constant variable has only one fixed value throughout the observations, unlike a variable that changes from one observation to another. Therefore, its values are fixed.
Correct answer: Fixed205. A chance variation in an observational process is_____________?
- A. Dispersion/ Variability
- B. Measurement error
- C. Random error
- D. Instrument error
Explanation: Chance fluctuations arising naturally in an observational or measurement process are called random error. Measurement or instrument error may have specific systematic causes, whereas random error refers to unpredictable variation.
Correct answer: Random error206. Population census is conducted through_______________?
- A. Sample survey
- B. Accounting
- C. Investigation
- D. Complete enumeration
Explanation: A census covers every unit in the population, so it is conducted by complete enumeration. A sample survey studies only a selected portion of the population.
Correct answer: Complete enumeration207. Life of a T.V picture tube is a____________?
- A. Discrete variable
- B. Continuous variable
- C. Qualitative variable
- D. Constant
Explanation: The life of a picture tube can take any value within a time interval, including fractional units such as 6.5 years. Such measurements are continuous variables, not discrete counts.
Correct answer: Continuous variable208. The first hand and unorganized form of data is called_______________?
- A. Secondary data
- B. Organized data
- C. Primary data
- D. None of these
Explanation: Primary data is collected firsthand by the investigator and is often initially available in raw, unorganized form. Secondary data has already been collected by someone else for another purpose.
Correct answer: Primary data209. Which of these represent qualitative data______________?
- A. Height of a student
- B. Liking or disliking of (500) persons of a product
- C. Income of a government servant in a city
- D. Yield from a wheat plot
Explanation: Liking or disliking records a quality or category rather than a numerical measurement, so it is qualitative data. Height, income, and crop yield are quantitative measurements.
Correct answer: Liking or disliking of (500) persons of a product210. If a distribution is abnormally tall and peaked, then is can be said that the distribution is_____________?
- A. Leptokurtic
- B. Pyrokurtic
- C. Platykurtic
- D. Mesokurtic
Explanation: A distribution that is unusually tall and sharply peaked has positive excess kurtosis and is called leptokurtic. Platykurtic distributions are flatter, while mesokurtic distributions have the normal level of peakedness.
Correct answer: Leptokurtic