Answer:
Three-quarters of the U.S. debt is the Treasury bills, notes, and bonds owned by the public. They include investors, the Federal Reserve, and foreign governments. One-quarter is the Government Account securities owned by federal agencies
Explanation:
Researchers record the average time it takes rats to complete the maze. In this study, the number of feed pellets was independent as per Manipulation of the Independent Variable
Manipulation of the Independent Variable Again, manipulating an independent variable involves systematically altering its levels so that different groups of participants are exposed to different levels of that variable, or This means that the groups will be exposed to different levels at different times. Independent variables are variables that researchers manipulate to better understand how phenomena, structure, and behavior are related to the dependent variable and Alternative Hypothesis . Instrumental variables are the independent variables in an experiment. It's called "manipulated" because it's something you can change. That is, you can decide in advance whether to increase or decrease. Experiments should always have only one instrumental variable.
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Explanation:
K is the answer i think:)
