In their book \"Introduction to Linear Regression Analysis\" (5th edition, Wiley

Question

In their book "Introduction to Linear Regression Analysis" (5th edition, Wiley, 2012), Montgomery, Peck, and Vining presented measurements on NbOC1 3 concentration from a tube- flow reactor experiment. The data, in gram-mole per liter x 10-3, are as 1911 2588 2635 2725 Now a stem-and-leaf diagram for the data has been given below. Use the diagram to answer questions (a) - (f) The decimal point is 2 digit(s) to the right of the | 4 5555671 10| 7915 12 | 2566 14 08 16 23 18 1 20 24 9 26|435 28 30 9 32 3

Explanation / Answer

a. Legend: 10|7=1.07. Readings for first and last data of the stem-and-leaf plot are 0.45 and 3.47.

b. The right tail of the distribution is far extended than the left tail. Therefore, the distribution is right skewed. There are no outliers visisble.

c. The distribution being right skewed, sample mean is larger than sample median.

d. The distribution shows high variability with a range of 3.02 (3.47-0.45), thus sample standard deviation does not give much useful information for skewed distribution.

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---