Find the confidence interval specified. assume that the population is normally distributed.
the principal randomly selected six students to take an aptitude test. their scores were: 81.6 72.0 81.1 86.4 70.2 83.1 determine a 90% confidence interval for the mean score for all students.
a. 84.49 to 73.65
b. 73.65 to 84.49
c. 84.39 to 73.75
d. 73.75 to 84.39

Which of the following is the result of expanding the series

Combine the information in the problem and the chart using the average balance method to solve the problem.

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.