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Question

, ' ù ww.webassign.net/web/Student/Assignment-Responses/submitdep.17602999 A national newspaper reported that the state with the longest mean life span is Hawail, where the population mean life span is 77 years. A random sample of 20 obituary notices in the Honolulu Advertizer gave the following information about life span (in years) of Honolulu residents. 72 68 81 93 56 19 78 94 8384 77 69 85 97 75 71 86 47 6627 () Use a calculator with sample mean and standard deviation keys to find x and s. (Round your answers to two decimal places.) yr s= yr normally distributed, does this information indicate that the population mean life (i) Assuming that life span in Honolulu is span for Honolulu residents is less than 77 years? Use a 5% level of significance. (a) What is the level of significance? State the null and alternate hypotheses (b) What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. O The Student's t, since we assume that x has a normal distribution and is unknown. The standard normal, since we assume that x has a normal distribution and is unknown. The standard normal, since we assume that x has a normal distribution and is known. The Student's t, since we assume that x has a normal distribution and is known.

Explanation / Answer

One-Sample T: C1

Test of = 77 vs < 77

Variable   N   Mean StDev SE Mean 95% Upper Bound      T      P
C1       20 71.65 20.69     4.63            79.65 -1.16 0.131

i)xbar = 71.65
s = 20.69
ii)
a) 0.05
option e) Ho: mu = 77 , H1: mu < 77
b)
option A)

TS = -1.16

c) p-value = 0.131
option B) 0.125 < p < 0.250 is correct
option B) top right graph

d)
option D)

e) option B

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