One-tailed test interpretations for three scenarios
Not what you're looking for?
Use the attached table to determine whether the correlations are significant and how you would interpret the results.
a. The correlation between speed and strength for 20 women is 0.567. Test these results at the 0.01 level using a one-tailed test.
b. The correlation between the number correct on a math test and the time it takes to complete the test is -0.45. Test whether this correlation is significant for 80 children at the 0.05 level of significance. Choose either a one-or two-tailed test and justify your choice.
c. The correlation between number of friends and grade point average (GPA) for 50 adolescents is 0.37. Is this significant at the 0.05 level for a two-tailed test?
Purchase this Solution
Solution Summary
One-tailed test interpretations for three scenarios are examined. The correlation between speed and strengths are determined.
Solution Preview
a. The correlation between speed and strength for 20 women is 0.567. Test these results at the 0.01 level using a one-tailed test.
Null hypothesis: r = 0
Alternative hypothesis: r > 0
This is one tailed t test.
The degree of freedom is 18(20-2 = 18),
At 0.01 significance level, the critical t value is 2.55.
Test value t = r*sqrt((n-2)/(1-r^2)) = 0.567*sqrt((20-2)/(1-0.567^2)) = 2.92
Since 2.92 > 2.55, we could reject null hypothesis.
Based on the test, we could ...
Purchase this Solution
Free BrainMass Quizzes
Know Your Statistical Concepts
Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.
Measures of Central Tendency
This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.