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Chapter 11: Q-19E (page 649)

Refer to Exercise 2.18 and calculate the number of the 600 items falling into each of the classes. Then graph a frequency histogram for these data.

Short Answer

Expert verified

A histogram can be defined as a set of rectangles with bases along with the intervals between class boundaries.

Step by step solution

01

Given information

02

Histogram

A histogram can be defined as a set of rectangles with bases and intervals between class boundaries. Each rectangle bar depicts some data, and all the rectangles are adjacent. The heights of rectangles are proportional to corresponding frequencies of similar as well as for different classes. Let's learn about histograms in more detail.

03

Computation table

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Most popular questions from this chapter

Stability of compounds in new drugs. Testing the metabolic stability of compounds used in drugs is the cornerstone of new drug discovery. Two important values computed from the testing phase are the fraction of compound unbound to plasma (fup) and the fraction of compound unbound to microsomes (fumic). A key formula for assessing stability assumes that the fup/fumic ratio is 1. Pharmacologists at Pfizer Global Research and Development investigated this phenomenon and reported the results in ACS Medicinal Chemistry Letters (Vol. 1, 2010). The fup/fumic ratio was determined for each of 416 drugs in the Pfizer database. An SPSS graph describing the fup/fumic ratios is shown below.

a. What type of graph is displayed?

b. What is the quantitative variable summarized in the graph?

c. Determine the proportion of fup/fumic ratios that fall above 1.

d. Determine the proportion of fup/fumic ratios that fall below .4

Refer to Exercise 11.14 (p. 653). Calculate SSE and s for the least-squares line. Use the value of s to determine where most of the errors of prediction lie.

Calculate SSE andfor each of the following cases:

a. n = 20,SSyy=95,SSxy=50,ฮฒ1^=.75

b. n = 40,โˆ‘y2=860 , โˆ‘y=50, SSxy=2700, ฮฒ1^=.2

c. n = 10, โˆ‘(yi-yยฏ)2=58,SSxy=91,SSxx=170

Give the slope and y-intercept for each of the lines graphed in Exercise 11.1.

Visually compare the scatter plots shown below. If a least squares line were determined for each data set, which do you think would have the smallest variance s2? Explain.
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