Which of the following statements is the correct answer? select one: a. when applying the scientific method making an initial observation is irrelevant b. whether a hypothesis generates a testable prediction or not is not important to test your hypothesis c. common sense is frequently a good substitute for scientific thinking when we are trying to understand how the environment around us work d. scientific thinking can be used only to understand scientific phenomena e. all the choices above are incorrect f. only statement 1 is correct

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.