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A researcher wants to study the effects of using the brain training software Lumosity on working...

A researcher wants to study the effects of using the brain training software Lumosity on working memory. The researcher thinks that it may actually help working memory, or it could be a drain on limited cogntive resources and hurt working memory. She randomly samples 50 individuals tests their working memory capacity after using Lumosity for 2 months. Working memory scores in the population are known to be normally distributed with a mean of 4 items, and a standard deviation of 1 item.

Population 1:

Population 2:

Research Hypothesis:

Null Hypothesis:

Math   Statistics-And-Probability   
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Answer #1

From given scenario, we have the following information about given hypothesis testing.

Population 1: Working memories of all individuals before using the brain training software Lumosity

Population 2: Working memories of all individuals after using the brain training software Lumosity

Research (Alternative) Hypothesis (Claim): Ha:There is a significant effect of the brain training software Lumosity on the working memory.

Null Hypothesis: H0: There is no any significant effect of the brain training software Lumosity on the working memory.

H0: µ1 = µ2 versus Ha: µ1 ≠ µ2

This is a two tailed test.

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