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16 Aug 2024, 02:24
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The graph shows the annual amount of salt (sodium chloride, or NaCl) used on roads in Nation X, for the purpose of melting snow and ice. The natural deposition is the average amount of salt that would be deposited on the surface of the country (by, for example, rainfall), regardless of human activities.
This use of salt has resulted in considerably increased concentrations of both sodium (Na) and chloride (Cl) in the country's surface water (rivers, streams, lakes)–sufficient to be toxic in both plants and fish, and for significant adverse human health effects due to increased salt intake. However, because sodium passes less easily through soils than chloride passes, the levels of extra sodium in the country's aquifers (underground water) are notably lower than the levels of extra chloride, and likely negligible in most locations.
This use of salt has resulted in considerably increased concentrations of both sodium (Na) and chloride (Cl) in the country's surface water (rivers, streams, lakes)–sufficient to be toxic in both plants and fish, and for significant adverse human health effects due to increased salt intake. However, because sodium passes less easily through soils than chloride passes, the levels of extra sodium in the country's aquifers (underground water) are notably lower than the levels of extra chloride, and likely negligible in most locations.
Measured amounts of sodium in drinking water derived from aquifers: No
Measured relative eye widths of male monarch butterflies: No
Measured relative eye widths of female monarch butterflies: Yes
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Difficulty:
55%
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Question Stats:
56% (03:32) correct
44%
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ID: 700359
For each of the following quantities, select Yes if the information provided indicates that a difference with respect to this quantity is statistically significant. Otherwise, select No.
For each of the following quantities, select Yes if the information provided indicates that a difference with respect to this quantity is statistically significant. Otherwise, select No.
| Yes | No | |
| Measured amounts of sodium in drinking water derived from aquifers | ||
| Measured relative eye widths of male monarch butterflies | ||
| Measured relative eye widths of female monarch butterflies |
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Measured amounts of sodium in drinking water derived from aquifers: No
Measured relative eye widths of male monarch butterflies: No
Measured relative eye widths of female monarch butterflies: Yes
Screenshot 2024-02-01 143756.png [ 155.84 KiB | Viewed 17089 times ]
Screenshot 2024-02-01 144437.png [ 162.11 KiB | Viewed 16094 times ]
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Screenshot 2024-02-01 143756.png [ 155.84 KiB | Viewed 17089 times ]
Attachment:
Screenshot 2024-02-01 144437.png [ 162.11 KiB | Viewed 16094 times ]
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19 Sep 2024, 14:45
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1. The question asks us whether the information can say that a difference in a quality is statistically significant. The text says that "differences are statistically significant when the experimental error intervals do not intersect".
2. Measured amounts of sodium in drinking water derived from aquifers. The text states that "the levels of extra sodium in the country's aquifers (underground water) are notably lower than the levels of extra chloride, and likely negligible in most locations". That means the difference in the quantity isn't statistically significant.
3. Measured relative eye widths of male monarch butterflies. Looking at the left part of the bar chart, we can say that the intervals do intersect. That means the difference in the quantity isn't statistically significant.
4. Measured relative eye widths of female monarch butterflies. Looking at the right part of the bar chart, we can say that the intervals don't intersect. That means the difference in the quantity is statistically significant.
GraphMonarchEye.jpg [ 54.71 KiB | Viewed 18007 times ]
2. Measured amounts of sodium in drinking water derived from aquifers. The text states that "the levels of extra sodium in the country's aquifers (underground water) are notably lower than the levels of extra chloride, and likely negligible in most locations". That means the difference in the quantity isn't statistically significant.
3. Measured relative eye widths of male monarch butterflies. Looking at the left part of the bar chart, we can say that the intervals do intersect. That means the difference in the quantity isn't statistically significant.
4. Measured relative eye widths of female monarch butterflies. Looking at the right part of the bar chart, we can say that the intervals don't intersect. That means the difference in the quantity is statistically significant.
Attachment:
GraphMonarchEye.jpg [ 54.71 KiB | Viewed 18007 times ]
