If based on a sample of size 400, a political candidate found that 240 people would vote for him in a two person race, what is the 90% confidence interval for his proportion of votes?

1. If based on a sample of size 400, a political candidate found that 240 people would vote for him in a two person race, what is the 90% confidence interval for his proportion of votes? Can he be reasonably certain of victory? Find a 90% confidence interval and explain. 2. The Excel file Blood Pressure shows diastolic blood pressure readings before and after a new medication. Find 95% confidence intervals for the variance for each of these groups. Based on these confidence intervals, would you conclude that the medication has kept the reading more stable?


 

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