425 school children were surveyed about what they want to be when they grow up, out of a choice of five professions. the results were teacher 80, doctor 105, lawyer 70, police officer 70, firefighter 100. a. obviously these particular children preferred some occupations over others. test whether their preference reflects a real difference in the population or not. b. which of the categories contributed the most to the chi-squared test statistic?

Adecibel is a logarithmic unit that can be used to measure the intensity of a sound. the function y = 10logx gives the intensity of a sound in decibels, where x is the ratio of the intensity of the sound to a reference intensity. the reference intensity is generally set at the threshold of hearing. use the graphing utility to graph the decibel function.a whisper has a sound intensity of 30 decibels. use your graph to you complete the following statement. the sound intensity of a whisper is times the reference intensity.