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Chapter 2: Q 25. (page 108)

Density curves Sketch a density curve that might describe a distribution that is symmetric but has two peaks.

Short Answer

Expert verified

Density curve is

Step by step solution

01

Step 1. Given

Density curves is a distribution that is symmetric but has two peaks.

02

Step 2. Concept

A density curve is the graph of a continuous distribution.

03

Step 3. Explanation 

A symmetrical density curve with two peaks that looks like this:

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Most popular questions from this chapter

Use Table A in the back of the book to find the proportion of observations from a standard Normal distribution that fall in each of the following regions. In each case, sketch a standard Normal curve and shade the area representing the region.

3.−0.56<z<1.81

T2.2. For the Normal distribution shown, the standard deviation is closest to

(a) 0

(b) 1

(c) 2

(d) 4

(e) 5

Baseball salaries Did Ryan Madson’s , who was paid $1,400,000, have a high salary or a low salary compared with the rest of the team? Justify your answer by calculating and interpreting Madson’s percentile and z-score.

Foreign-born residents The percentile plot below shows the distribution of the percent of foreign-born residents in the 50 states.

(a) The highlighted point is for Maryland. Describe what the graph tells you about this state.

(b) Use the graph to estimate the 30th percentile of the distribution. Explain your method.

T2.4. The figure shows a cumulative relative frequency graph of the number of ounces of alcohol consumed per week in a sample of 150adults. About what percent of these adults consume between 4and 8ounces per week?

(a)20%(b)40%(c)50%(d)60%(e)80%
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