An ambulance service claims that the proportion, p, of calls received that involve life-threatening emergencies is greater than 47%. Can we support this claim at the 0.10 level of significance, if 123 calls out of a random sample of 220 calls selected from the service's files involved life-threatening emergencies? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places and round your answers as specified in the table. (If necessary, consult a list of formulas.) (a) State the null hypothesis Ho and the alternative hypothesis H,. P D Ho : 1 X S p H : 0 An (b) Determine the type of test statistic to use. Chi-square Degrees of freedom: O=0 030 020 (c) Find the value of the test statistic. (Round to three or more decimal places.) 0*0 00 0 X 5 ? (d) Find the p-value. (Round to three or more decimal places.) 0 (e) Can we support the claim that the proportion of calls received that involve life-threatening emergencies is greater than 47%? OYes ONo