Answer:
d
Explanation:
Neurons and nerve impulses
Answer:
The correct answer is paired sample t-test.
Explanation:
Based on the given information, the mothers living in poverty in the United States give birth to underweight babies. The average weight of the babies given birth by women living in poverty is 2.8 kg. To examine the efficacy of a novel prenatal care program, a test was conducted by the CDC in which 30 mothers living in poverty and the weights of their babies were recorded.
As the test is conducted in pairs, thus, paired sample t-test would be the appropriate hypothesis test. The paired t-test is performed when the dependent variable is measure spontaneously. In the given case, the women participating in the program and the number of babies with less birth weight are examined in pairs. Thus, as the sample are paired together, the correct answer would be paired sample t-test.
Answer:
Explanation:
Calcination is a process in which ore is heated in the absence of air or air might be supplied in limited quantity. Roasting involves heating of ore lower than its melting point in the presence of air or oxygen. Calcination involves thermal decomposition of carbonate ores.
Answer:
True
Explanation:
Algae are autotrophs and do not depend on plants for food and energy. Mushrooms are fungi that can derive their nutrition from dead and decaying bodies of algae in absence of plants and animals. So, both algae and mushrooms can survive in absence of plants.
Fruits, vegetables and grains are obtained from plants. If there would not by any plants, these plant products would not be available. Animals are heterotrophs and depend directly or indirectly on plants for food and energy. So, animals cannot sustain life without plants.
Hence, given statement is true.