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Can you please explain? Thank you In a random sample of 87 college students, the average number of GroupMe messages handled in one day is

Can you please explain? Thank you

In a random sample of 87 college students, the average number of GroupMe messages handled in one day is 49. The 95% confidence interval for the mean number of messages handled by students daily is given as 47 to 51.

1) What is the population standard deviation of the sample?

2) If the number of samples was doubled, by what factor would the confidence interval change (keeping the same confidence level?)

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