You work for a consumer advocate agency and want to find themean repair cost of

Question

You work for a consumer advocate agency and want to find themean repair cost of a washing machine. As part of yourstudy, you randomly select 55 repair costs and find the meanto be $124.00. The sample standard deviation is $18.70.
Construct a 90% confidence interval for the population meanrepair cost. You work for a consumer advocate agency and want to find themean repair cost of a washing machine. As part of yourstudy, you randomly select 55 repair costs and find the meanto be $124.00. The sample standard deviation is $18.70.
Construct a 90% confidence interval for the population meanrepair cost.

Explanation / Answer

n=55, xbar=124, s=18.7 =0.1, Z(0.05)=1.645 (check normal table) The 90% CI is xbar±1.645*s/n -->124±1.645*18.7/sqrt(55) -->(119.85,128.15)

Related Questions

Navigate

• Browse (All)
• Browse Y
• Subjects

---

---

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