A national news network asks viewers to call in to participate in a poll about whether or not viewers believe crime has increased over the past five years. About 10000 viewers call in, with 72% reporting that they believe crime has increased. True or false: Since everyone had a chance to call, this was a simple random sample of the national population. Explain. What could make the sample random?

2.40.∗ Aninterval scale for which ratios are valid is called a ratio scale. Such scales have a well-defined 0 point, so, for instance, one can regard the value 20 as twice the quantity of the value 10. Explain why annual income is measured on a ratio scale, but temperature (in Fahrenheit or Centigrade)

is not. Is IQ, as a measure of intelligence, a ratioscale variable? Explain.