Which of the following may have an adverse effect on a correlation coefficient?

Question

Which of the following may have an adverse effect on a correlation coefficient?

Too many participants

Eliminating all possible sources of error

Restricting the range of possible scores

Too few participants

1 points   

QUESTION 9

If there is a positive correlation between hours spent attending lectures and final grade of degree achievement, then it can be concluded that?

Spending more time attending lectures will improve degree success.

The degree score can be accurately predicted from number of hours of lectures attended.

Students who attend most lectures get the highest grade of degree.

There is not enough information to infer anything

1 points   

QUESTION 10

When two variables are correlated with each other and with a third variable, which type of correlation is suggested?

Weak

Partial

Perfect

Negative

1 points   

QUESTION 11

The covariance is

An unstandardized version of the correlation coefficient.

A measure of the strength of relationship between two variables.

Dependent on the units of measurement of the variables.

All of the above.

1 points   

QUESTION 12

A researcher conducts some research in which they identify a significant positive correlation (r = .42) between the number of children a person has and their life satisfaction. Which of the following is it inappropriate to conclude from this research?

That having children makes people more satisfied with their life.

That someone who has children is likely to be happier than someone who doesn't.

That the consequences of having children are unclear.

That it is possible to predict someone's life happiness partly on the basis of the number of children they have.

1 points   

QUESTION 13

A researcher is wishing to undertake a study of the relationship between a specific type of analgesia and levels of pain experienced by sufferers of rheumatoid arthritis. It is believed that level of physical activity will influence both of these variables and so it has been decided that the use of partial correlations will allow for this in the research. On which of the following should a correlation be performed?

Type of analgesia used and level of pain experienced, controlling for level of physical activity

Level of pain experienced and level of physical activity, controlling for type of analgesia used

Type of analgesia used and physical activity level, controlling for level of pain experienced

None of the above

1 points   

QUESTION 14

In order for accurate measures of the linear relationship between two variables to be achieved, what type of data are required if using Pearson’s correlation coefficient?

Interval

Nominal

Ordinal

Categorical

Q 18 Suppose you wanted to identify the strength of a relationship between the FIFA world ranking of a country’s football team and the subsequent performance in the World Cup. What type of correlation test might you run?

Pearson’s coefficient

Spearman’s rho

Kendall’s tau

Kolmogorov–Smirnov

QUESTION 19

Suppose you were interested in the relationship between body mass and basal metabolic rate and calculated an r value of –.79. How would you account for the variability between the two variables?

Square the r-value.

Take the square root of the r-value.

Take the log of the r-value.

Divide the r-value by itself.

QUESTION 20

Sports scientists were interested in the effects of anxiety and experience on high board diving performance. All three variables are correlated with each other, but what correlation test could be run if you wanted to find out the degree of ‘exclusive’ variance anxiety had on diving performance without the interaction of the experience variable?

Partial correlation

Biserial correlation

Point-biserial correlation

Semi-partial correlation

Too many participants

Eliminating all possible sources of error

Restricting the range of possible scores

Too few participants

Explanation / Answer

I can only do 1st question if i do other than it is against Chegg policy, Sorry!!!

1

The correct answer is option C

Restricting the range of possible scores

Restricting ranges affect correlations when the range has restricted the correlation goes down

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.