Purchase Solution

Critical values for testing correlation (r^2)

Not what you're looking for?

Ask Custom Question

1. The IQ scores of 30 children from under-privileged households, were measured before and a year after, a program of nutritional supplementation was instigated at a primary school. Use a two-tailed test. Is there an effect of nutritional supplementation? Submit your answers on a standard answer sheet.

(e) Given a (alpha) =0.05, what is the critical value of t? (use a two tailed test)
(f) Would an obtained value of t of 2.30 lie within the rejection region?
(g) Does nutritional supplementation affect IQ scores (given that the obtained t =2.30)?
(h) This result would be reported as: t ( ___ ) = _______, p _____ 0.05, r^2=

looking for some steps for e,f,g,h?

Purchase this Solution
Solution Summary

The solution provides answer to the question whether correlation is significant

Solution Preview

1. The IQ scores of 30 children from under-privileged households, were measured before and a year after, a program of nutritional supplementation was instigated at a primary school.  Use a two-tailed test.  Is there an effect of nutritional supplementation?  Submit your answers on a standard answer sheet.

(e) Given alpha=0.05, what is the critical value of t? (use a two tailed test)
(f) Would an ...

Purchase this Solution
Free BrainMass Quizzes
Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

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.

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.

View More Free Quizzes
Related BrainMass Solutions

  • 5 Steps to Performing a Hypothesis Test

    So, the degree of freedom df=n-2=15-2=13. To determine the critical values of r, we use alpha/2=0.05/2=0.025. By looking up the critical value table (see attached), we get the critical values +/- 0.514.

  • Testing for Linear Correlation

    497621 Testing for Linear Correlation Testing for a linear correlation. Construct a scatter plot, find the value of the linear correlation coefficient r, and find the critical values of r from the table below using a=0.05.

  • MCQ on ANOVA, Correlation, Hypothesis

    values: r = 0.217, significant linear correlation Answer: Critical values: r = ±0.207, significant linear correlation From the table critical value for significance level of 0.05 and degrees of freedom of n-2= 90-2=88 is 0.207 Therefore critical

  • Correlations Between Speed and Strength

    Let r be the correlation coefficient. We need to test Ho: r=0 vs. Ha: r≠0. Test statistic when n=20 is r*sqrt[(n-2)/(1-r2)]=0.567*sqrt[(20-2)/(1-0.5672)]=2.92 with degrees of freedom = 20-2=18 Critical value at 0.01 leve and df=18 is 2.5244<2.92.

  • 11 statistics problems

    Critical values: r =± 0.878, no significant linear correlation Critical values: r =± 0.950, significant linear correlation 2.

  • Correlation & Regression Analysis

    What is the critical value of r from the table showing the critical values for the Pearson Correlation coefficient using, coefficient=0.05? Is there a linear correlation between the two variables? 3.

  • Correlation Testing

    null hypothesis tested is H0: r =0 H1:r ≠ 0 Test Statistic used is Rejection criteria : Reject the null hypothesis , if the calculated value is grater than critical value of t with (n-2) d.f at 0.05 significance level Here r =

  • Hypothesis Testing



    The critical value of r, at a 0.05 level of significance, is 0.632 (from a critical value table using degrees of freedom caluclated as df=N-2, which is 8 in this case).

  • Women's heights and pulse rates

    |r| = |0.251| = 0.251 Step 3) Look up the appropriate critical value in a table of Critical Values of the Pearson Correlation Coefficient r. Note) Some tables use n, the number of women tested.

  • Statistics: Hypothesis testing, Correlation

    Find the value of the correlation coefficient, r. The correlation between X, Y is given by the formula = 0.978255696 2. Find the critical value of r from Table A-6 using α = 0.05. Critical value of r = 0.8114 3.

View More Related Solutions