Use this scenario to answer the next three questions.

r. a. fisher, a famous statistician, describes a well-known design in his book, design of experiments. five varieties of wheat were compared to determine which gave the highest yield in bushels per acre. eight farms were available for planting. each farm was divided into five plots. for each farm, the five varieties were randomly assigned to the five plots with one variety per plot. the varieties were planted on their assigned plots and their yields were measured and compared.

what type of study is this?

Experiment - randomized block design

Explanation:

A randomized block design (RBD) is an experimental study where the scientist classifies subjects into different groups, denominated blocks. The subjects within each block are assigned to the different treatments, varieties of wheat in this example.

A randomized block design is effective when the subjects within blocks are comparable in how they influence the response variable but differ from other blocks.

c. taught scientists many new things about the earth, but not other planets.

explanation:

levels of production can be increased by technology while holding labor and capital constant, because increased technology makes the production process more efficient. subsequently, the lras curve is almost a vertical line, that can shift to the right, with an increase in technology.

the relationship between the lras curve and the ppc is that both can make the economy could grow. the ppc achieves that when it shifts outward because of more resources or technological advances while the lras curve shifts if more resources are developed or if there are technological advances.

the lras curve is a vertical line at an output level that represents the number of goods and services a nation can produce over a sustained period using all of its productive resources as efficiently as possible with all of the current technology available to it.

the production possibilities frontier (ppf) is a graphical device that is used for economic analysis of production decisions because the ppf measures the maximum possible combinations of two goods that an economy is capable of producing with its currently available resources and technology.