The speed of sound is approximately 1.2 x 10^3 km/h. How long does it take for sound to travel 7.2 x 10^2 km? Write your answer
1 answer:
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Answer:
a)
b)
Step-by-step explanation:
The sample proportion have the following distribution
Part a
The estimated proportion for this case can be calculated like this:
Part b
In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by and
. And the critical value would be given by:
The confidence interval for the mean is given by the following formula:
Replacing we got: