Suppose a phone company reports that the average duration of a cell phone call is 1.7 minutes with a standard deviation of 1.4 minutes.
-Would "the sampling distribution of the average duration call will approximately follow a normal distribution with mean 1.7 minutes and standard deviation $1.4 / \sqrt{60}$ or 0.181 minutes. and Note: The sample size is greater than 30 , so you are willing to assume the shape will be approximately normal, even though the population distribution is most plausibly skewed to the right. This is appropriate as long as the skewness is not too severe. " be larger, smaller, or the same if the (population) standard deviation of call durations were 1.8 minutes rather than 1.4 minutes? Explain briefly.

Question

Suppose a phone company reports that the average duration of a cell phone call is 1.7 minutes with a standard deviation of 1.4 minutes.
-Would "the sampling distribution of the average duration call will approximately follow a normal distribution with mean 1.7 minutes and standard deviation $1.4 / \sqrt{60}$ or 0.181 minutes. and Note: The sample size is greater than 30 , so you are willing to assume the shape will be approximately normal, even though the population distribution is most plausibly skewed to the right. This is appropriate as long as the skewness is not too severe.  " be larger, smaller, or the same if the (population) standard deviation of call durations were 1.8 minutes rather than 1.4 minutes? Explain briefly.

Quizplus · Accepted Answer

The Answer of Suppose a phone company reports that the average duration of a cell phone call is 1.7 minutes with a standard deviation of 1.4 minutes.
-Would "the sampling distribution of the average duration call will approximately follow a normal distribution with mean 1.7 minutes and standard deviation $1.4 / \sqrt{60}$ or 0.181 minutes. and Note: The sample size is greater than 30 , so you are willing to assume the shape will be approximately normal, even though the population distribution is most plausibly skewed to the right. This is appropriate as long as the skewness is not too severe.  " be larger, smaller, or the same if the (population) standard deviation of call durations were 1.8 minutes rather than 1.4 minutes? Explain briefly.

Suppose a Phone Company Reports That the Average Duration of a Cell