8.57×10*-4 in standard form
2 answers:
Answer:
The required standard form is: 0.000857
Step-by-step explanation:
Consider the provided number.
If the exponent of 10 is a negative number then move the decimal point to the left.
If the exponent of 10 is a positive number then move the decimal point to the right
Here the exponent of 10 is a negative number so move the decimal point left.
Hence the required standard form is: 0.000857
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<u>Answer</u>: No, we do not have sufficient evidence to conclude that the mean call duration, µ, is different from the 2010 mean of 9.4 minutes.
Step-by-step explanation:
As per given , we have
, since
is two-tailed so , the test is a two tail test.
Since population standard deviation is unknown, so we use t-test.
Critical value (two-tailed) for significance level of 0.01=
For n =50 , and s= 4.8
Test statistic :
Since test statistic value (-1.18) lies in critical interval (-2.609228, 2.609228), it means the null hypothesis is failed to reject.
We do not have sufficient evidence to conclude that the mean call duration, µ, is different from the 2010 mean of 9.4 minutes.