Question

In a survey of 299 people from city A, 122 preferred New Spring soap to all...

In a survey of 299 people from city A, 122 preferred New Spring soap to all other brands of deodorant soap. In city B, 141 of 392 people preferred New Spring soap. Find the 90% confidence interval for the difference in the proportions of people from the two cities who prefer New Spring soap. (Use city A - city B. Give your answers correct to three decimal places.)

Lower Limit: _______

Upper Limit: _______

Math   Statistics-And-Probability   
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Answer #1

The statistical software output for this problem is:

Hence,

90% confidence interval will be:

Lower limit = -0.013

Upper limit = 0.110

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