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Chapter 2: Q. 2.148 (page 82)

Sickle Cell Disease. A study published by E. Anionwu et al. in the British Medical Journal (Vol, 282, pp .283-286) measured the steady-state hemoglobin levels of patients with three different types of sickle cell disease. Following is a stem-and-leaf diagram of the data.

Short Answer

Expert verified

The distribution is roughly symmetric.

Step by step solution

01

Given Information

To determine whether the given graph is symmetric or right-skewed or left-skewed.

02

Explanation

A stem and leaf plot is a classification tool for discrete and continuous variables. To organise data as it is acquired, a stem and leaf plot is employed. A stem and leaf plot resembles a bar graph in appearance. The name comes from the fact that each number in the data is divided into a stem and a leaf.

Let's consider the given graph:

The tallest peak in the graph is nearly in the middle of the stem and leaf plot. Therefore, the distribution is roughly symmetric.

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Most popular questions from this chapter

Days to Maturity for Short-Term Investments. Refer to the days-to-maturity data in Table 2.6 on page 53 . Note that there are 40observations, the smallest and largest of which are 36and 99, respectively. Apply the preceding procedure to choose classes for limit grouping. Use approximately seven classes. Note: If in Step 2 you decide on 10 for the class width and in Step 3 you choose 30 for the lower limit of the first class, then you will get the same classes as used in Example 2.13; otherwise, you will get different classes (which is fine).

Suppose that you have constructed a stem-and-leaf diagram and discover that it is only moderately useful because there are too few stems. How can you remedy the problem?

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