Answer:
The sample mean is obviously different from the population mean, but tests of significance must be done to determine if the difference is statistically significant. The difference could possibly be attributed to chance or to sampling error.
Explanation:
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Answer:
O silicon (Si)
Explanation:
-Valence electrons are electrons of the outermost shell which can participate in chemical bonding. ... -As in silicon, four electrons are present in the outermost shell, so silicon has Four valence electrons.
The best way to reduce wind erosion on farm is to plant ground cover in unused fields.
Explanation:
- Wind erosion is defined as the removal of the top soil from unused barren land by winds.
- This results in degradation in the soil fertility and renders it unproductive.
- Roots of plants bind soil particles.
- Planting ground covers like herbs , shrubs and wild plants on unused land will prevent the exposure of the top soil to the eroding agents and reduce erosion.