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You Are Evaluating Investing in a Cognitive Training Company

question 94

Multiple Choice

You are evaluating investing in a cognitive training company.For this reason,you want to determine whether users who complete at least 75% of the recommended daily training for two months show improved levels of reading comprehension and problem solving skills.You select a random sample of new users and get test scores for each participant in the sample.The test score is a composite of reading comprehension and problem solving skills.Two months later,you randomly select 15 users who have completed 75% or more of the recommended training for the last two months and have them take a test similar to the initial test.You are interested in determining whether the average test score before training is different than the average test score after training for this sample.The after-training average is 92.8,which is 2.7 points higher than the before-training average.The sample standard deviations of the differences is 1.2.You can assume that the differences are normally distributed in the population.The degrees of freedom for this test are ______.

Definitions:

Personal Injuries

Harm suffered by an individual to their body, mind, or emotions, as opposed to damage to property.

Contract Excludes

Specific provisions or clauses within a contract that explicitly nullify the inclusion of certain terms, rights, or obligations.

Repudiation

It refers to the rejection or denial of a duty or obligation in a contract, essentially indicating that one party will not honor their commitments.

Tender

The formal offer to perform work or supply goods at a specified price; also refers to the act of offering payment in legal transactions.