Answer: t=-5.651
Explanation:
Let 
be the population mean number of hours a week answering their email.
As per given we have
Sample size : n= 783
Sample mean : 
Sample standard deviation: s=7.23
Since population standard deviation is unknown, so our test -statistic has a t-distribution.
Test statistic : 
∴ The test statistic : t=-5.651
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It can be a technique to shorten or make it still at the point of conversation and avoid unrelated issues or situation. It also makes the discussion brief and concise. This provides other people to give their own opinion at a given time. There also might be an allotted time for each people.
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