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Sunny Sky: Must be true
Strong Wind: May not be true
Normal Humidity: Must be true
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
25% (01:48) correct
75%
(01:43)
wrong
based on 115
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History
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The following table shows if Noel enjoys Hiking and/or Swimming, given certain weather conditions:
If Noel would enjoy Hiking AND Swimming today, select "Must be true" if the weather condition would be true for today, and "May not be true" if the weather condition need not be true for today, from the data given in the table.
| Sky | AirTemp | Humidity | Wind | Enjoy Hiking | Enjoy Swimming |
|---|---|---|---|---|---|
| Sunny | Warm | Normal | Strong | Yes | Yes |
| Sunny | Warm | High | Strong | Yes | No |
| Rainy | Cold | High | Strong | No | No |
| Sunny | Warm | High | Weak | Yes | No |
| Cloudy | Warm | Normal | Weak | No | Yes |
If Noel would enjoy Hiking AND Swimming today, select "Must be true" if the weather condition would be true for today, and "May not be true" if the weather condition need not be true for today, from the data given in the table.
| Must be true | May not be true | Today's Weather Condition |
| Sunny Sky | ||
| Strong Wind | ||
| Normal Humidity |
ShowHide Answer
Official Answer
Sunny Sky: Must be true
Strong Wind: May not be true
Normal Humidity: Must be true
26 Aug 2026, 10:26
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For a condition to be "Must be true," it needs to hold in every case where the activity is enjoyed — not just in one specific row.
When Noel enjoys Hiking - checking for all data points where Enjoy Hiking is "yes" - Sky is always Sunny, AirTemp is always Warm. Humidity varies (Normal/High), Wind varies (Strong/Weak) — so neither Humidity nor Wind is necessary for Hiking.
When Noel enjoys Swimming - checking for all data points where Enjoy Swimming is "yes" - AirTemp is always Warm, Humidity is always Normal. Sky varies (Sunny/Cloudy), Wind varies (Strong/Weak) — so neither Sky nor Wind is necessary for Swimming.
Combining the two observations, for Noel to enjoy both Hiking and Swimming, Sky should be Sunny, AirTemp should be Warm and Humidity should be Normal.
So, Sunny Sky - Must be true
Strong Wind - May not be true
Normal Humidity - Must be true
When Noel enjoys Hiking - checking for all data points where Enjoy Hiking is "yes" - Sky is always Sunny, AirTemp is always Warm. Humidity varies (Normal/High), Wind varies (Strong/Weak) — so neither Humidity nor Wind is necessary for Hiking.
When Noel enjoys Swimming - checking for all data points where Enjoy Swimming is "yes" - AirTemp is always Warm, Humidity is always Normal. Sky varies (Sunny/Cloudy), Wind varies (Strong/Weak) — so neither Sky nor Wind is necessary for Swimming.
Combining the two observations, for Noel to enjoy both Hiking and Swimming, Sky should be Sunny, AirTemp should be Warm and Humidity should be Normal.
So, Sunny Sky - Must be true
Strong Wind - May not be true
Normal Humidity - Must be true
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