Asample of a given size is used to construct a 95% confidence interval for the population mean with a known population standard deviation. if a bigger sample had been used instead, then the 95% confidence interval would have been and the probability of making an error would have been
60% of y is 72
25% of y is 30 so multiply 30 by 4 and you get 120. multiply 120 by .60 and that leaves you with 72 as your answer.
y = 0
we are given the following equation and we are to find the value of y when x equals to 28:
substituting the given value of x in the above equation:
therefore, y = 0 when x = 28.