Question

A random digit dialing telephone survey of 908 drivers asked, "Recalling the last ten traffic lights you drove through, how many of them were red when you entered the intersections?" Of the 908 respondents, 185 admitted that at least one light had been red.

Give a 96% confidence interval (±0.001) for the proportion of all
drivers who ran one or more of the last ten red lights they
met: ⩽p⩽⩽p⩽ .

Answer #1

We have given,

x=185

n=908

Estimate for sample proportion=
0.2037

Level of significance is =1-0.96=0.04

Z critical value(using Z table)=2.054

Confidence interval formula is

=(0.176,0.231)

0.176<p<0.231 |

A random digit dialing telephone survey of 880 drivers asked,
"Recalling the last ten traffic lights you drove through, how many
of them were red when you entered the intersections?" Of the 880
respondents, 168 admitted that at least one light had been red.
(a) Give a 95% confidence interval for the proportion of all
drivers who ran one or more of the last 10 red lights they
encountered. (Use the plus four method. Round your answers to four
decimal...

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(18.02) A survey of licensed drivers inquired about running red
lights. One question asked, "Of every ten motorists who run a red
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for 934 respondents was x¯¯¯ = 1.96 and the standard deviation was
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