About one third of the world’s population lives in these two countries:
2 answers:
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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