Q:

Ch. 8, pp. 284 –Exercise 18a,b,c,d

According to an IRS study, it takes a mean of 330 minutes for taxpayers to prepare, copy, and electronically file a 1040 tax form. This distribution of times follows the normal distribution and the standard deviation is 80 minutes. A consumer watchdog agency selects a random sample of 40 taxpayers.

o   What is the standard error of the mean in this example?

o   What is the likelihood the sample mean is greater than 320 minutes?

o   What is the likelihood the sample mean is between 320 and 350 minutes?

o   What is the likelihood the sample mean is greater than 350 minutes?

 

 

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