Questions from Statistics

Q: Construct a scatterplot. What does the result suggest? /

Construct a scatterplot. What does the result suggest?

Q: Estimate the value of the linear correlation coefficient r for the points

Estimate the value of the linear correlation coefficient r for the points shown in the scatterplot in Figure 7.23.

Q: Estimate the value of the correlation coefficient. What does that value

Estimate the value of the correlation coefficient. What does that value suggest?

Q: In a clinical trial of the effectiveness of a gender selection method

In a clinical trial of the effectiveness of a gender selection method, it is found that there is a 0.005 probability that the results could have occurred by chance. Does the method appear to be effect...

Q: Can we conclude that the cost of a slice of pizza has

Can we conclude that the cost of a slice of pizza has a direct causal effect on the subway fare? Explain briefly.

Q: Find or estimate the value of r2. What does that value

Find or estimate the value of r2. What does that value tell us?

Q: Does it appear that the best-fit line can be used

Does it appear that the best-fit line can be used to make a reasonably good prediction of subway fare given the cost of a slice of pizza?

Q: Using the equation for the best-fit line, we find

Using the equation for the best-fit line, we find that when a slice of pizza costs $1000, the predicted subway fare is $1011. Is that predicted subway fare likely to be an accurate prediction? Why or...

Q: For 10 pairs of sample data values, the correlation coefficient is

For 10 pairs of sample data values, the correlation coefficient is computed to be r = -1. What do you know about the scatterplot?

Q: In a study involving randomly selected subjects, it is found that

In a study involving randomly selected subjects, it is found that there is a strong correlation between household income and number of visits to dentists. Is it valid to conclude that higher incomes c...