-12 - x = 8 - 3x Solve for x
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Answer:
Step-by-step explanation:
Given : The speeds of vehicles traveling on a highway are normally distributed .
Standard deviation:
Since , sample size : , which is small sample (n<30) so the test applied here is a t-test.
Degree of freedom=
Sample mean :
Level of significance :
Then , significance level :
Using t-distribution table , Critical value :
The confidence interval for population mean is given by :-
Hence, a 98% confidence interval for the population mean=