Question

View Policies Current Attempt in Progress Please use the accompanying Excel data set or accompanying Text file data set when completing the following exercise. An electrical engineer must design a circuit to deliver the maximum amount of current to a display tube to achieve sufficient image brightness. Within her avoidable design constraints, she has developed two candidate circuits and tests prototypes of each. Use the normal approximation for the Wilcoxon rank-sum test to determine if circuit 2 has a higher mean current than circuit 1. Use a -0.05. The resulting data (in microamperes) are as follows: Circuit 1: 251 255 258 257 250 251 254 250 248 Circuit 2: 250 253 249 256 259 252 260 251 (Note: Circuit 2 is treated as Sample 1; see p. 397.) (a) Calculate wa (b) Calculate the test statistic zo. (Round your answer to 2 decimal places.) (c) Using the Standard Normal Table, determine the P-value for testing H0: 1 - 2 versus H 1:21 > 2. P-value- (Round your answer to 4 decimal places.) Conclusion: Statistical Tables and Charts

Answer 1

(a) 78

(b) 0.58

(c) 0.2819

Fail to reject the null

n	sum of ranks
8	78	Group 1
9	75	Group 2
17	153	total
	72.000	expected value
	10.392	standard deviation
	0.58	z
	.2819	p-value (one-tailed, upper)