Does the use of fancy type fonts slow down the reading of text on a computer scr

Question

Does the use of fancy type fonts slow down the reading of text on a computer screen? Adults can read four paragraphs of text in an average time of 22 seconds in the common Times New Roman font. Ask 25 adults to read this text in the ornate font named Gigi. Here are their times. 21.9 24.9 23.5 29.2 26.5 25.6 21.5 21.3 28.0 26.5 22.3 22.4 25.9 22.5 21.5 23.7 24.6 22.9 22.7 23.4 25.7 20.5 26.4 27.0 20.6 Suppose that reading times are Normal with = 4 seconds. Is there good evidence that the mean reading time for Gigi is greater than 22 seconds? (Use = 0.05.)

What is the z value? What is the P value?

Explanation / Answer

Here H0: mu=22 vs H1: mu>22

Now sample mean xbar=24.04

And sd=4

So se=sd/sqrt(n)=4/5=0.8

Now z=xbar-mu/se=24.04-22/0.8=2.55

The P-Value is 0.005386.

The result is significant at p < 0.05.

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