https://www.math d t/player stionld-148flushed h& 9/12/18 9:18 PM Homework: Home

Question

https://www.math d t/player stionld-148flushed h& 9/12/18 9:18 PM Homework: Homework Week6 Score: 0.25 of 1 pt 14 of 18 (13 complete) Hw score: 68.06%, 12.25 of 18 pts 6.2.25- The state test scores for 12 randomly selected high school seniors are shown on the right. Complete parts (a) through (c) below 1430 1228 723 744 1445 Assume the population is normally distributed 724 (a) Find the s x-910.7 (Round to one decimal place as needed) (b) Find the sample standard deviation s 305.1 (Round to one decimal place as needed) (c) Construct a 90% confidence interval for the population mean A 90% confidence interval for the population mean is (Round to one decimal place as needed) Enter your answer in the edit fields and then click Check Answer Clear All All parts showing

Explanation / Answer

solution:-
(a) mean x = 910.7
(b) sample standard deviation = 305.1
(c) 90% confidence with df = 12 - 1 = 11 is t = 1.796
confidence interval formula
=> x +/- t * s / sqrt(n)
=> 910.7 +/- 1.796 * 305.1 / sqrt(12)
=> (752.5 , 1068.9)

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.