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Chapter 10: Q.10.135 (page 443)

Font Readability. In the online paper "A Comparison o Two Computer Fonts: Serif versus Ornate Sans Serif" (Usability News, Issue 5.3), researchers S. Morrison and J. Noyes studied whether the type of font used in a document affects reading speed or comprehension. The fonts used for the comparisons were the serif font Times New Roman (TNR) and a more ornate sans serif font called Gigi. The following table gives the times, in seconds, that it took each of the 25participants to read paragraphs in the TNR and Gigi fonts.

Suppose that you want to perform a hypothesis test to determine whether, on average, people read faster with the TNR font than with the Gigi font. Conduct preliminary graphical data analyses to decide whether applying the paired t-test is reasonable. Explain your decision.

Short Answer

Expert verified

It is not possible to apply the paired t-test.

Step by step solution

01

Given Information

The sample size is25.

02

Explanation

The probability plot is

The box plot is,

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Most popular questions from this chapter

Acute Postoperative Days. Refer to Example 10.6(page 420). The researchers also obtained the following data on the number of acute postoperative days in the hospital using the dynamic and static systems.

At the 5%significance level, do the data provide sufficient evidence to conclude that the mean number of acute postoperative days in the hospital is smaller with the dynamic system than with the static system? (Note: x_{1}=7.36,s_{1}=1.22,x_{2}=10.50and s_{2}=4.59.)

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