Carboxyhemoglobin is formed when hemoglobin is exposed to carbon monoxide.

Carboxyhemoglobin is formed when hemoglobin is exposed to carbon monoxide. Heavy smokers tend to have a high percentage of carboxyhemoglobin in their blood} Letxbe a random variable representing percenmge of carboxyhemoglobin In the blood. For a person who is a regular heavy smoker, x has a distribution that is approximately normal. A random sample of n = 12 blood tests given to a heavy smoker gave the following results (percent carboxyhemoglobin in the blood). Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value a small amount and thereby produce a slightly more "conservative\" answer. 9.4 9.5 10.2 9.8 11.3 12.2 11.6 10.3 8.9 9.7 13.4 9.9 (a) Use a calculator to calculate x and 5. (Round to four decimal places.) (b) A longsterm population mean 0 = 10% is considered a health risk. However, a longsterm population mean above 10% is considered a clinical alert that the person may be asymptomatic. Do the data indicate that the population mean percentage is higher than 10% for this patient? Use (1 : 0.05. (i) What is the level of significance? S State the null and alternate hypotheses. 0 HQ: 0 : 10%; H]: p 10% 0 H0: [.4 : 10%; H]: p at 10% O H0: 0 > 10%; H1: 0 : 10% (ii) What sampling distribution will you use? What assumptions are you making? 0 The standard normal, since we assume thatx has a normal distribution with unknown 0. O The Student's 1', since we assume that x has a normal distribution with known a. O The standard normal, since we assume thatx has a normal distribution with known tr. 0 The Student's 1', since we assume that x has a normal distribution with unknown 0. What is the value of the sample test statistic? (Round your answer to three decimal places.) : (iii) Find (or estimate) the Pavalue. O Pavalue > 0.250 O 0.125