On October 13, 2012. President Obama had an approval rating of 48% (according to

Question

On October 13, 2012. President Obama had an approval rating of 48% (according to a Gallup Poll). Suppose a sample of 100 Americans was taken that same week. What is the probability that the sample proportion had between a 42% and a 50% approval rating (Use 4 or more decimal places in your computations?) If the sample size were to increase, what would happen to the value of sigma_r? It would stay the same It is impossible to tell without knowing a proportion It would increase It would decrease The resting heart rate of US males 20 years old or older is normally distributed with a mean of 82 bpm (beats per minute). Suppose the standard deviation was 15 bpm. If one randomly selected male's resting heart rate falls in the bottom 33% of all women at most what could her rate have been?

Explanation / Answer

Question 5.

ans) b. 5403

Question 6.

ans) d. It would decrease

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