Question 12 Find the critical value from Table A-6 used to test for correlation

Question

Question 12

Find the critical value from Table A-6 used to test for correlation between two variables at 0.01 significance level, given that a sample of 10 paired data points is collected from a population.

Write your answer for example in the form 0.352

Question 6

Researchers collect data on 5,134 American adults younger than 60. They measure the reaction times (in seconds) of each subject to a stimulus on a computer screen and how many years later the subject died.

The researchers are interested in whether reaction time can predict time to death (in years).

The researchers found that people with slower reaction times tended to die sooner. In a scatterplot of the reaction time and the number of years to death, you expect to see

(a) a positive association.

(b) very little association.

(c) a negative association.

Question 5

Researchers collect data on 5,134 American adults younger than 60. They measure the reaction times (in seconds) of each subject to a stimulus on a computer screen and how many years later the subject died.

The researchers are interested in whether reaction time can predict time to death (in years). When you make a scatterplot, the explanatory variable on the x axis

(a) is the reaction time.

(b) is the time to death.

(c) can be either reaction time or time to death.

Question 4

Identify the explanatory and response variables in the following. Furthermore, determine whether the explanatory variable explains or influences changes in the response variable.

How sensitive to changes in water temperature are coral reefs? To find out, scientists examined data on sea surface temperatures and coral growth per year at locations in the Red Sea.

Question options:

the explanatory variable in the problem causes or explains changes in the response variable.

There is no explanatory variable.

None of these

Question 3

Identify the explanatory and response variables in the following. Furthermore, determine whether the explanatory variable explains or influences changes in the response variable.

Some diseases are seasonal. Mumps for instance is one of such diseases. Mumps is an extremely contagious viral disease. It is known to occur mainly in children during peak summer.

Question options:

the explanatory variable in the problem influences the changes in the response variable.

There is no explanatory variable.

None of these

A)

the explanatory variable in the problem causes or explains changes in the response variable.

C)

There is no explanatory variable.

D)

None of these

Question 17 Researchers measured the percent body fat and the preferred amount of salt ercent weight/volume for several children. Here are data for seven children: Preferred amount of salt x 0.2 0.3 0.4 0.5 0.6 0.8 1.1 Percent body fat y 20 30 22 30 38 23 30 Use your calculator or software: what is the equation of the least-squares regression line for predicting percent body fat from prefemed amount of salt? (a)y 24.2 6.0x (b)y 0.15 +0.01x (c)y 6.0 24.2x

Explanation / Answer

(12)

n = 10

Degrees of freedom = 8

Critical value of r for = 0.01 is r = 0.765

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