statistic questions

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3.) A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 636 babies were​ born, and 318 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the percentage of girls born. Based on the​ result, does the method appear to be​ effective?

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Use the data in the table to the right to answer the following questions.

Find the sample proportion of candy that are red.

The proportion of red

​(Type an integer or decimal rounded to three decimal places as​ needed.)

5.) A study of 420,088cell phone users found that 136 of them developed cancer of the brain or nervous system. Prior to this study of cell phone​ use, the rate of such cancer was found to be 0.0315% for those not using cell phones. Complete parts​ (a) and​ (b).

a. Use the sample data to construct a 95% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system.

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