You are asked to study the causal effect of hours spent on employee training​ (measured in hours per worker per​ week) in a manufacturing plant on the productivity of its workers​ (output per worker per​ hour). Required:
a. Choose a random group of employees to receive ten hours per week in additional training for a period of four weeks.​ Then, estimate the difference in productivity between workers who received the additional training and those that did not. Option best describes this statement.
b. Data on hours spent on training a group of ten different employees in a certain day. Option best describes this statement.
c. Data on hours spent on training the same employee for seven consecutive days. Option best describes this
d. Data on hours spent training for a group of ten individual employees for seven consecutive days. Option best describes this statement.

1. an observational time series data set.
2. an observational cross — sectional data set.
3. an ideal randomized controlled experiment.
4. an observational panel data set.

2. the external environment (connect)choose whether each example belongs in the general, task, or internal environment. exampleenvironmenta worldwide recession task environment / general environment / internal environmentlocal mothers asking their community grocery store to carry no-salt cheerios-type cereal for their babies task environment / general environment / internal environmentchoose the phrase that best completes the following sentence. the relationship between the task environment and the general environment is best described as: a one-way system: changes in the task environment affect the general environment, but changes in the general environment do not affect the task environment. an open system: changes in the task environment affect the general environment, and changes in the general environment affect the task environment. a one-way system: changes in the general environment affect the task environment, but changes in the task environment do not affect the general environment. a closed system: changes in the general environment do not affect the task environment, and changes in the task environment do not affect the general environment.©bloomberg via getty imagesmanagement in the newsin april 2010, the explosion of british petroleum’s (bp) deepwater horizon oil drilling rig and the accompanying oil spill dramatically changed the external environment in which all oil companies operate. the explosion released more oil than any other accidental spill in history and had a huge impact on the waters and surrounding communities of the gulf coast. the conditions that led to the spill, the attempts to stop the spill, and the clean-up and aftermath of the spill prompted debates in the u. s. senate, concern on wall street, and attention from companies all over the world. match each oil spill event with a specific dimension of the general environment. eventgeneral environment dimensionbp stock prices falling 25% during the first month after the oil spill oil seeping into pelican nesting grounds, which will place the brown pelican back on the endangered species list people moving from louisiana to oklahoma to avoid the effects of the spill