A social media company would like to know what proportion of users are clicking on a targeted ad in their news feed. They find that the 95% confidence interval for the proportion of users who click on the targeted ad out of a sample of users exposed to this ad is (0.62, 0.72). Which of the following statements gives a valid interpretation of the 95% level of confidence?单项选择题
A
There is a 95% chance that the sample proportion of users who clicked on the ad is between 0.62 and 0.72.
B
We are 95% confident that the true population proportion of users who clicked on the ad is between 0.62 and 0.72.
C
If the sampling procedure was repeated many times, 95% of the resulting confidence intervals would not include the true population proportion of users who clicked on the ad.
D
If the same sampling procedure was repeated many times, 95% of the resulting sample proportions would be between 0.62 and 0.72.
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If we change a 95% confidence interval estimate to a 90% confidence interval estimate, we can expect the _____.
The expression used to compute an interval estimate of μ may depend on any of the following factors EXCEPT _____.
A hospital administrator hoping to improve wait times decides to estimate the average emergency room waiting time at her hospital. She collects a simple random sample of 64 patients and determines the time (in minutes) between when they checked in to the ER until they were first seen by a doctor. A 95% confidence interval based on this sample is between 125 minutes and 148 minutes. Which of the following statements is true?
What value of z should you use for a 99% confidence interval for the difference of two population proportions?
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