Answer:
a. - 3. an ideal randomized controlled experiment
b. - 2. an observational cross a sectional data set.
c. - 1. an observational time series data set.
d. - 4. an observational panel data set.
Step-by-step explanation:
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 3. an ideal randomized controlled experiment best describes this statement.
b. Data on hours spent on training a group of ten different employees in a certain day.
Option 2. an observational cross â sectional data set best describes this statement.
c. Data on hours spent on training the same employee for seven consecutive days.
Option 1. an observational time series data set best describes this
d. Data on hours spent training for a group of ten individual employees for seven consecutive days.
Option 4. an observational panel data set best describes this statement.