Posted by **Ethel** on Monday, July 8, 2013 at 4:21pm.

b. The correlation between the number correct on a math test and the time it takes to complete the test is -.45. Test whether this correlation is significant for 80 children at the .05 level of significance. Choose either a one-or two-tailed test and justify your choice.

- Statistics!!! -
**MathGuru**, Monday, July 8, 2013 at 7:02pm
To find if there is a statistically significant linear relationship between the number correct on a math test and the time it takes to complete the test, use N-2 for degrees of freedom at the .05 significance level for a one-tailed test or a two-tailed test. Use a table for critical or cutoff values for a Pearson r. Compare the value from the table to the test statistic stated in the problem. If the test statistic exceeds the critical value from the table (negative direction for a one-tailed in this case or either direction for a two-tailed), the null will be rejected. There will be a linear relationship in the population and the test will be statistically significant. If the test statistic does not exceed the critical value from the table, then the null will not be rejected and you cannot conclude a linear relationship in the population.

- Statistics!!! -
**Anonymous**, Monday, October 12, 2015 at 10:17am
-4.45

## Answer this Question

## Related Questions

- statistics - A professor is interested in knowing the correlation, if any, of ...
- statistics - . A professor is interested in knowing the correlation, if any, of ...
- Psychology Statistics - 2 For a sample of n = 20 individuals, how large a ...
- statistics in psychology - 11. Make up a scatter diagram with 10 dots for each ...
- statistics - For problems 12 to 14, do the following: (a) Make a scatter diagram...
- statistics - For problems 12 to 14, do the following: (a) Make a scatter diagram...
- Study Test- Need help to do good on real test!!!!! - A study wants to examine ...
- Psychology - Four research participants take a test of manual dexterity (high ...
- Statistics!!! - c. The correlation between number of friends and grade point ...
- Statistics!!! - a. The correlation between speed and strength for 20 women is ....

More Related Questions