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In a random sample of 80 teenagers, the average number of texts handled in a day...

In a random sample of 80 teenagers, the average number of texts handled in a day is 50. The 96% confidence interval for the mean number of texts handled by teens daily is given as 46 to 54. a) What is the standard deviation of the sample? b) If the number of samples were doubled, by what factor would the confidence interval change (keeping the same confidence level?)

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