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(solution) A researcher posed a null hypothesis that there was no


A researcher posed a null hypothesis that there was no significant difference between boys and girls on a standard memory test. He randomly sampled 100 girls and 120 boys in a community and gave them the standard memory test. The mean score for girls was 70 and the standard deviation of mean was 5.0. The mean score for boys was 65 and the standard deviation of mean was 6.0.

What?s the absolute value of the difference between means?

What is the standard error of the difference in means?

What?s the t-value (two-tailed) for the null hypothesis that boys and girls have the same test scores?

 


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