Question: Parameter Versus Statistic. In each of the following statements, identify the boldface number as the value of a population parameter or a sample statistic.
a. The maker of a new, enhanced water product conducted a survey to determine if people are drinking enough liquids each day. In a random sample of Americans, 90% were chronically dehydrated.
b. Last year, the proportion of all robberies in Washington, D.C., that involved a cellphone was 0.42.
c. NASA reported that the mean time for all spacewalks at the International Space Station was 45 minutes.
d. The International Energy Agency reported that 93% of Canada's renewable energy comes from hydroelectric sources.
e. In a random sample of publishing companies, 23% of sales were ebooks.