15 of 50 # successes is the formula to calculate the # trials O sample mean sample proportion margin of error 16 of 50 If you increase the sample size and confidence level at the same time, what will happen to the length of your confidence interval? O make it bigger O make it smaller O it will stay the same O cannot be determined from the given information 17 of 50 You take a random sample from some population and form a 95% confidence interval for the population mean, J. Which quantity is guaranteed OX O 95