Question

Time needed to travel to work in Japan has a normal distribution and SD Sigma. As...

Time needed to travel to work in Japan has a normal distribution and SD Sigma.

As seen, to estimate the population mean time it takes to travel to work in Japan: SE=6 mins & 99% confidence & a sample of 44.

Now calculate the sample size for SE=8 mins & 95% confidence?

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Answer #1

In Normal distribution the Standard Error is Calculated by

  

Where sigma is the Standard deviation and n is the sample size.

Here the given information:

n= 44 and SE =6 mins

To find

n , when SE =8

By using the first set of values we will find the sigma -

  

For the New value of n When the SE =8

  

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