The Law School Admission Test (LSAT) is standardized test used in the applicatio

Question

The Law School Admission Test (LSAT) is standardized test used in the application and admission process for those interested in attending law school in the U.S.A. The LSAT is scored on a scale of 120 - 180, with the mean score of about 150. You have a "test enhancement" business in Texas and have developed a new half-day seminar method designed to increase LSAT scores, called the LSAT-TexPrep method (LTPM, for short). You are quite sure that your new method will increase LSAT scores and you want to offer a money back guarantee in your advertisements. However, you're no fool. So before you begin advertising, you test the accuracy of your claim that participation in the LTPM will, indeed, lead to higher LSAT scores. Nine college students planning on applying to law school who have taken the LSAT before are recruited to participate in LTPM and then retest on the LSAT. Label their initial scores on the LSAT the "Before" condition (X_1), and call the retest on the LSAT the "After" condition (X_2). The before and after LSAT scores are below. Setting alpha at alpha = 01, summarize the results of the hypothesis testing procedure by putting your results in journal form. Ignore the minus sign if your calculated t is negative. t (8) = 3.84, p > 01 t (16) = 3.84, p

Explanation / Answer

t-stat = -.84

p-value = 0.004928

p-value < 0.01

option b) is correct

t-Test: Paired Two Sample for Means Variable 1 Variable 2 Mean 140.5555556 148 Variance 143.2777778 150.5 Observations 9 9 Pearson Correlation 0.885290255 Hypothesized Mean Difference 0 df 8 t Stat -3.842713542 P(T<=t) one-tail 0.002464091 t Critical one-tail 1.859548038 P(T<=t) two-tail 0.004928183 t Critical two-tail 2.306004135

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