Question: The software company that wrote the operating system installed on CCC's computers recently issued an important update. The update is designed to install automatically, and

The software company that wrote the operating system installed on CCC's computers recently issued an important update. The update is designed to install automatically, and the software company stated that users should experience few difficulties with the installation.

Wishing to see whether users experienced difficulty, CCC took a random sample of 200 of its customers, and asked them if the upgrade occurred without any issues. A total of 30 customers reported having difficulty of one form or another. CCC wishes to estimate,the proportion ofallof its customers who experienced difficulty with the update.

Suppose CCC wishes to calculate a 90% confidence interval for . What probability distribution should be used in the calculation of the margin of error?

Suppose CCC wishes to calculate a 90% confidence interval for . Which of the following values would be used in the calculation?

In calculating a90% confidence interval for , the estimate of the standard error is

A 90% confidence interval for is 0.15 0.042, that is the interval from 0.108 to 0.192. Therefore it is correct to say

When the Chicago Daily Tribune announced that "Dewey Defeated Truman", what were the major issues regarding the polling techniques?

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