Entered Answer Preview Result 64500 1083.33 1083.33 correct 623767 62376.7 inco

Question

Entered Answer Preview Result 64500 1083.33 1083.33 correct 623767 62376.7 inco 66623 9 66623.29 ncorrect correc At lcast one of the answers above is NOT correct. pt) In a ceain stnall city, the Mayot would like to kow heaverage incorue of 25000 failies. A suvey is conducted ad took asmple tandom sample of 900 families. The average incnme of hese families is 64.500 dollas. The SD of the 900 incorues is S32.500 hus, the Mayor concludes that the average income of the city 64500 he 5 percent contident interval for the arverage incomes ofll the farnilies is from 623767 Note: I can eapartial cril on this problen. give or take 103 33 dollars to 66623 29 dollars (Hint Use the approxmate 2 SDs above and elothe average instead of the exact 196 from the z-table) this problem.

Explanation / Answer

Answer

Answer to first two fill in the blanks is correct.

only incorrect answer is for the 95% confidence interval

It is clearly mentioned in the question that we have to use approximate 2SDs above and below the average.

so, we get

Upper limit = Average + 2SD = 64500 + (2*32500) = 129500

and

Lower limit = Average - 2SD = 64500 - (2*32500) = - 500

so, 95% confidence interval is (-500, 129500)

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

---

---

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