Let x be a random variable that represents red blood cell count (RBC) in millions of cells per cubic millimeter of whole blood. Then x has a distribution that is approximately normal. For the population of healthy female adults, suppose the mean of the x distribution is about 4.66. Suppose that a female patient has taken six laboratory blood tests over the past several months and that the RBC count data sent to the patient's doctor are as follows. 4.9 4.2 4.5 4.1 4.4 4.3 A button hyperlink to the SALT program that reads: Use SALT. (a) Use a calculator with sample mean and standard deviation keys to find x and s. (Round your answers to four decimal places.) x = 4.4000 Correct: Your answer is correct. s = 0.28 Incorrect: Your answer is incorrect. See the rounding prompt for how many decimal places are needed. (b) Do the given data indicate that the population mean RBC count for this patient is lower than 4.66? Use ???? = 0.05. (i) What is the level of significance? 0.05 Correct: Your answer is correct. State the null and alternate hypotheses. (Enter != for as needed.) H0: Correct: Your answer is correct. H1: Correct: Your answer is correct. (ii) What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. The standard normal, since we assume that x has a normal distribution and ???? is known. The standard normal, since we assume that x has a normal distribution and ???? is unknown. The Student's t, since we assume tha