O one login Thread Unit 6 C Secune l https://www.mathod.com/student/Player Test

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O one login Thread Unit 6 C Secune l https://www.mathod.com/student/Player Test ?testld 157763967 MAT220.34 Statistics MoD4 ONLINE A6430 17E Test: POST UNIT 6 TEST Ch. 9 B 4 complete The lowing data negresent the age on weeks) at whichbabies trstoautbased ana survey of 12motes that the sample size does not am outiers Aethe condbona A yes the poortasen normary disaiouted and the sample does not rontan any No he sampie contains an ascanding anser Round to one decima place needed at 4008 Rao te non wew table rea under tutor Search the web and windows This Test: 8 pes possble

Explanation / Answer

(a) Here answer of part (a) is Yes, the population is normally distributted and the sample does not contain any outlier.

(b) 95% confidence interval for the mean age of crawling

so mean of the sample = 38.42 weeks and standard error = 13.34 weeks

so 95% confience interval = xmean +- 1.96 * s/ n = 38.42 +- 1.96 * (13.34/ 12)

= (30.87, 45.97)

(c) Obviously the n factor is in denominator so incresing it will give it more accurate interval for the mean without changing level of confidence. so option A is correct.

52 30 44 35 47 37 56 26 39 8 52 35 mean 38.41667 std. dev. 13.34479

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