In international trade, an exchange rate is . A. a way to record a nation’s imports and exports B. an agreement between nations to reduce trade barriers C. a chart for keeping track of prices on a stock exchange D. a number that is used to show the value of one currency compared to another In international trade, an exchange rate is . A. a way to record a nation’s imports and exports B. an agreement between nations to reduce trade barriers C. a chart for keeping track of prices on a stock exchange D. a number that is used to show the value of one currency compared to another

What is the difference between an observational study and an​ experiment? choose the correct answer below. a. in an​ experiment, a treatment is applied to part of a population and responses are observed. in an observational​ study, a researcher measures characteristics of interest of a part of a population but does not change existing conditions. b. in an​ experiment, a treatment is applied to an entire population and responses are observed. in an observational​ study, a researcher measures characteristics of interest of an entire population but does not change existing conditions. c. in an​ experiment, a researcher measures characteristics of interest of a part of a population but does not change existing conditions. in an observational​ study, a treatment is applied to part of a population and responses are observed. d. in an​ experiment, a researcher measures characteristics of interest of an entire population but does not change existing conditions. in an observational​ study, a treatment is applied to an entire population and responses are observed.