Question

Determine whether descriptive or inferential statistics were used, explain why I. In 2025, the world population is predicted to be 8 billion people. 2. In 2011, there were 34 deaths from the avian flu. 3. Based on a sample of 2739 respondents, it is estimated that pet owners spent a total of 14 billion dollars on veterinarian care for their pets. 4. In 2011, 79% of U.S. adults used the Internet. 5. In 2010, a total of 68,905 people died from diabetes 6. In 2008-2009, a total of 260,327 U.S. students were studying abroad. 7. Forty-four percent of the people in the United States have type O blood. 9. Researchers stated that the shape of a person's ears is relative to the person's aggression

Answer 1

Descriptive statistics is concerned about the target population , presenting the data in a meaningful manner in the form of charts , graphs , tables . Descriptive statistics uses central tendencies (mean , median , mode ) and spread (range and standard deviation ) to describe the data.

Whereas inferential statistics makes inference using sample of the target population , make comparison among population, predicts future outcomes . Inferential statistics uses analysis tools such as estimation, hypothesis testing , analysis of variance, correlation , regression etc

1. Inferential statistics ( as we have predicted future outcome: population prediction of 2025 )

2. descriptive statistics ( as we have only presented the data : deaths from avian flue in 2011)

3. Inferential statistics ( based on sample , we estimate how much pet owners spend)

4. Inferential statistics ( On the basis of sample observation , we estimated population proportion of Internet users)

5. descriptive statistics ( as we have only presented the data : deaths from diabetics  in 2010)

6. descriptive statistics ( as we have only presented the data : number of students studying abroad)

7. Inferential statistics ( On the basis of sample observation , we estimated population proportion of type O blood group)

9. Inferential statistics ( On the basis of correlation analysis , conclusions are drawn )