Differentiate between accuracy and precision. $5.$ Explain the important elements of measurements. $6.$ Discuss the relationship between accuracy and cost. $7.$ Accuracy is defined as $($a$)$ a measure of how often an experimental value can be repeated $($b$)$ the closeness of a measured value to the real value $($c$)$ the number of significant figures used in a measurement $($d$)$ none of these $8.$ Random errors can be assessed $($a$)$ experimentally $($b$)$ by performing sensitivity analysis $($c$)$ statistically $($d$)$ empirically $9.$ Systematic errors are $($a$)$ controllable errors $($b$)$ random errors $($c$)$ uncontrollable errors $($d$)$ none of these