A Psychologist Has Designed a New Intelligence Test

question 43

Multiple Choice

A psychologist has designed a new intelligence test. Historically, time to complete the old test was an average of 120 minutes. With the altered format of the test, the psychologist claims that the time to complete the test is no longer 120 minutes. A sample of 50 new test taking times yielded an average time of 118 minutes. The population standard deviation is known to be 5 minutes
-The null and alternative hypothesis to test if the average time to complete the test had changed from 120 minutes is _____.

• A)H₀: µ = 120 H_a: µ ≠ 120
• B)H₀: µ ≥ 120 H_a: µ < 120
• C)H₀: µ ≤ 120 H_a: µ > 120
• D)H₀: µ ≠ 120 H_a: µ = 120
• E)H₀: µ ≥ 118 H_a: µ < 118

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Definitions:

Photosynthesis

The method through which green plants and certain other organisms utilize sunlight to create nutrients from carbon dioxide and water.

ATP and NADPH

Adenosine triphosphate (ATP) and Nicotinamide adenine dinucleotide phosphate (NADPH) are crucial molecules in cellular energy transfer and photosynthesis, serving as energy currency and reducing power, respectively.

Light-dependent Phase

The first stage of photosynthesis where sunlight is absorbed and used to produce energy carriers ATP and NADPH.

Chemoheterotrophs

Organisms that obtain their energy and carbon from organic compounds, typically by consuming other organisms or organic matter.