Fine the measurements. Are this correctly?

What is the difference between –12 and –5? what is the distance between –12 and –7 on a number line? units

How would you describe the difference between the graphs of f(x) = 2x2 and g(x) = -2x2?

Arandom sample of 15 observations is used to estimate the population mean. the sample mean and the standard deviation are calculated as 172 and 63, respectively. assume that the population is normally distributed. a. with 99 confidence, what is the margin of error for the estimation of the population mean? b. construct the 99% confidence interval for the population mean. c. construct the 95% confidence interval for the population mean. d. construct the 83% confidence interval for the population mean. hint: you need to use excel function =t.inv.2t to find the value of t for the interval calculation.