Suppose Appendix Table A.3 contained Φ(z) only for z ≥0 Explain how you could still compute
a. P( –1.72≤ Z ≤–.55)
b. P( –1.72≤ Z ≤ .55)
Is it necessary to tabulate Φ(z) for z negative? What property of the standard normal curve justifies your answer?
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