6) Identify if the following requires one-tailed or two-tailed test. Write O if one-tailed, T if two-tailed: 1. A researcher claims that the brightness of light affects learning 2. A food additive enhances food flavor 3. A study habit improves the memory 4. Health is related to lifestyle 5. People's culture afects tourism 6. Eight hours of sleep boosts energy the next day 7. A certain tea influences alertness while driving 8. Lowering the brightness of cellphone lengthens its battery life 9. Temperature has an effect on plant growth 10.Walking daily lessens stress level

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