6*(5.2)/2 + 3*[6*(8.3)/2]
Domain- from left to right.: Range- from top to bottom.
Hello!
We are told that the Father’s Day gift was $75, the cost of which was split between three people. This can be represented using the following equation:
(Beth) + (James) + (Buzz) = $75
We know that Beth and James each contributed $25. Now we can rewrite the equation with the given information and then simplify:
$25 + $25 + (Buzz) = $75
$50 + (Buzz) = $75
Now subtract $50 from both sides and simplify:
$50 (-$50) + (Buzz) = $75 (-$50)
Buzz = $25
We have now proved that Buzz contributed $25.
I hope this helps!
The test statistic for difference between two means is given by:
Thus, the appropriate test statistic is given by:
At 10% level of significance, the rejection region is given by
where:
for 10% level of significance is 1.65
Since z = 1.66 >
, we reject the null hypothesis, which means that <span>the traffic control strategy does not reduce carbon monoxide concentrations by at least 2 ppm.</span>