A simple random sample of size is draw. The sample mean, X is found to be 17.8,

Question

A simple random sample of size is draw. The sample mean, X is found to be 17.8, and the sample standard deviation, s, is four to be 4.7. click the icon to view the table of areas under the t-distribution. Construct a 95% confidence interval about mu if he sample size, n, is 34. Lower bound 16.16; Upper bound: 19.44 (Use ascending order. Round to two decimal places as needed). Construct a 95% confidence interval about mu if the sample size, n, is 51. Lower bound: 16.48: upper bound: 19.12 (Use ascending order. Round to two decimal places as needed) How does increasing the sample size affect the margin of error, E? The margion of error increases. B. The margion of error decreases. C. he margion of error not change. Construct a 99% confidence interval about mu if the sample size n, is 34. Lower bound;upper bound (Use ascending order. Round to two decimal places as needed)

Explanation / Answer

53 + (20log(3) + (10log4pi)) = 73.53 dB

53/4 = 13.25 dB

13.25 - 73.53+ 10log(4pi) = - 49.29

- 20log(x) = - 49.29

-49.29/-20 = log(x)

10^x = 291.40 m from source.

check:

73.53 - (20log(291.40) + 10log(4pi)) = 35.23 dB

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