An experiment to investigate the survival time in hours of an electronic component consists of placing the parts in a test cell and running them under elevated temperature conditions. six samples were tested with the following resulting failure times (in hours): 34, 40, 46, 49, 61, 64. (a) calculate the sample mean and sample standard deviation of the failure time. (b) determine the range of the true mean at 95% confidence level.

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.