Exercises 1. A random sample of 15 metal rods used in an automobile suspension s

Question

Exercises 1. A random sample of 15 metal rods used in an automobile suspension system is selected, and the diameter is measured. The sample mean and standard deviation are 8.23 and 0.025 mm respectively. Assuming that the distribution of rod diameter is normal, find a 99% confidence interval on mean rod diameter. 2. A quality control technician is checking the weights of a product. She takes a random sample of 8 units and weights each unit. The observed weights are: 50, 48, 55, 52, 53, 46, 54, 50 Construct a 97% CI for the mean weight of the units. STAT220: Engineering Statistics 18

Explanation / Answer

1.

Using minitab :

One-Sample T

N Mean StDev SE Mean 99% CI
15 8.23000 0.02500 0.00645 (8.21078, 8.24922)

2.

One-Sample T: C11

Variable N Mean StDev SE Mean 97% CI
C11 8 51.00 3.07 1.09 (48.05, 53.95)

Hope this will be helpful. Thanks and God Bless You :-)

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

---

---

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