6/8/18 7:57 Test: Chapter 5 Post-Test (Callahan) This Question: 1 pt CS Submit 4
ID: 3375991 • Letter: 6
Question
6/8/18 7:57 Test: Chapter 5 Post-Test (Callahan) This Question: 1 pt CS Submit 4 of 10 (0 complete) This Test: 10 pts po The accompanying table descnbes results from groups of 8 births from 8 different sets of parents. The random variable x represents the number of girts among 8 children. Complete parts (a) through (d) below EEB Click the icon to view the table a. Find the probability of getting exactly 6 girls in 8 births Type an integer or a decimal Do not round) b. Find the probability of getting 6 or more girls in 8 births (Type an integer or a decimal Do not round,) c. Which probability is relevant for determining whether 6 is a significantly high number of girls in 8 births: the result from part (a) or part (b)? OA. Since the probability of getting 6 girls is the result from part (a), this is the relavant probability O B. Since the probability of getting fewer than 6 girls is the complement of the result from part (b), this is the relevant probability ? ?. srce the probability of getting 7 or 8 grs includes getting 6 gins, the result from part (b) is the relevant probabilty. O D. Since the probability of getting 7 or 8 girls s less likely than gett g 6 grs, the resuit from part (a)s the relevant p babity d. Is 6 a significantly high number of girls in 8 births? Why or why not? Use 0.05 as the threshold for a significant event O A. No, since the appropniate probability is greater than 0 05, t is not a significantly high number O B. Yes,since the appropriate probablity is less than 0 05, t s a significantly high number ° C. Yes, since the appropriate probably s greater than O05, it is a significantly high number O D. No, since the appropriate probability is less than 0 05, t is not a significantly high numberExplanation / Answer
The table shows us the probability of the exact number of girls among 8 births.
a) The probability of getting exactly 6 girls in 8 births = 0.114
b) Probability of getting 6 or more girls in 8 births = 0.114 + 0.008 + 0.003 = 0.125
c) As our part b) probability also includes the probability of 6 girls among 8 births, this probability is relevant. Hence the answer is C.
d) As the probability comes out to be more than 0.05 (0.125>0.05), 6 is a significantly high number of births.
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