branden Matta 1 3/15/18 7:12 PM Homework: Homework Chapter 8 Save core: 0 of 2 p
ID: 3062546 • Letter: B
Question
branden Matta 1 3/15/18 7:12 PM Homework: Homework Chapter 8 Save core: 0 of 2 pts 20t 6 (2 complete) HWScore: 119%,167 of 14 pts .2.17-T A consumer organization wants to estimate the actual tread wear index of a brand name of lires that claims "graded 200 on the sidewall of the fire. A random of n -23 indicates a sample mean tread wear index of 193 9 and a sample standard deviation of 18.4 Complete parts (a) through (c) a. Assuming that the population of tread ear ihdexes normally d tributed, construct IE Question Help sample for tires produced by this manufacturer under this brand name a 90% confidence interval estim ate of the population mean tread wear index s (Round to two decimal places as needed )Explanation / Answer
SOLUTION: 8.2-17-T
Mean = 193.9
t critical = 1.72
sM = (18.4)^2/23) = 3.84
= M ± t(sM)
= 193.9 ± 1.72*3.84
= 193.9 ± 6.588
M = 193.9, 90% CI [187.312, 200.488].
You can be 90% confident that the population mean () falls between 187.31 and 200.49.
I have done the first one. Please repost others questions separately. Thank you :)
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.