In this blog you will find the correct answer of the Coursera quiz Quantitative Methods Coursera Week 2 Quiz mixsaver always try to brings best blogs and best coupon codes

Week- 2

Scientific Method


1. If in the testing phase our predictions are confirmed by the data, does this mean we have definitively proven the hypothesis?


  • No
  • Yes
  • It depends

2. If the data support our predictions, this leads us to conclude that


  • We need to develop new predictions that can be disconfirmed
  • Our predictions are confirmed, but we cannot say anything about the hypothesis
  • The hypothesis is provisionally supported

3. Heavey, Russell and Noelle (2012, p. 763) stated that: “How you feel may influence your facial expression, may be influenced by your facial expression, may be otherwise related to your facial expression, or none of the above, so a scientist’s observation of your facial expression (a third-person act) cannot be substituted for your own direct apprehension of your feelings (a first-person act)”. Here, the authors doubt the


  • Construct validity of studies using facial expressions
  • External validity of studies using facial expressions
  • Internal validity of studies using facial expressions

4. By combining data from various publicly available sources Harvard Law School student Tyler Vigen has found out that there’s a correlation between the number of movies Nicolas Cage appears in each year and the number of people who drown in their swimming-pools. The MOST logical conclusion is that


  • Correlation doesn’t imply causation
  • No causal inference can be made from observational data
  • Less people will drown in their swimming pool once Cage retires

5. Suppose a researcher hypothesizes a causal relationship between breastfeeding and children’s health at age 4 years exists and investigates this hypothesis by measuring health characteristics of a group of four year olds and by asking their mothers whether the child was breastfed or not. Suppose a relation is indeed found. The most obvious threat to internal validity in this situation is:


  • Selection effect
  • Maturation effect
  • Selection by maturation effect

6. Testing effects due to practice/learning from exposure to repeated testing can be eliminated by


  • Randomization
  • Including groups that are exposed to a pre-test and groups that aren’t
  • Using tests with high construct validity

7. In a famous study by psychologist John Bargh subjects had to create a sentence from scrambled words. When these words related to being old, participants walked more slowly when they left the laboratory. In a recent replication study, Doyen, Klein, Pichon and Cleeremans (2012) found that participants walked more slowly only when they were tested by experimenters who expected this effect. This seems to point to


  • The impact of demand characteristics
  • An experimenter expectancy effect
  • The need to misguide participants

8. A researcher is interested in the effect of the perceived freedom of speech on social cohesion in small communities. She investigates small communities in China – which has a low perceived freedom of speech – and Malaysia – which has a relatively high perceived freedom of speech. The study runs for ten years. The study started two years before China relaxed its policy of restricting couples to have only one child. This policy change represents a


  • History threat to internal validity
  • Mortality threat to internal validity
  • Temporal ambiguity threat to internal validity

9. Willingness to take risks is assumed to be an important component of entrepreneurship. We hypothesize that willingness to take risks causes people to start and run a business. Here,


  • Willingness to take risks is the dependent variable
  • Entrepeneurship is the dependent variable
  • Willingness to take risks is the outcome variable

10. Suppose an observational study indicates a positive relation between weekly ice cream consumption and murder rates. Which of the following are possible lurking variables?


  • Weapon possession and population size
  • Season of the year and heat waves
  • Neither of the two options


Peer-graded Assignment: Scientific Method – Writing Assignment (Creative)

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Scientific Method – Writing Assignment (Creative)

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