Quantitative Methods Coursera Week 2 Quiz

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?