Answer:
We know that In 1990, the mean duration of long-distance telephone calls originating in one town was 7.2 minutes. And we want to test if the mean duration of long-distance phone calls has changed from the 1990 mean of 7.2 minutes (alternative hypothesis) and the complement rule would represent the null hypothesis.
The correct system of hypothesis are:
Null hypothesis: ![\mu =7.2](https://tex.z-dn.net/?f=%5Cmu%20%3D7.2)
Alternative hypothesis: ![\mu \neq 7.2](https://tex.z-dn.net/?f=%5Cmu%20%5Cneq%207.2)
So then the best option for this case would be:
H0: μ = 7.2 minutes Ha: μ ≠ 7.2 minutes
Step-by-step explanation:
We know that In 1990, the mean duration of long-distance telephone calls originating in one town was 7.2 minutes. And we want to test if the mean duration of long-distance phone calls has changed from the 1990 mean of 7.2 minutes (alternative hypothesis) and the complement rule would represent the null hypothesis.
The correct system of hypothesis are:
Null hypothesis: ![\mu =7.2](https://tex.z-dn.net/?f=%5Cmu%20%3D7.2)
Alternative hypothesis: ![\mu \neq 7.2](https://tex.z-dn.net/?f=%5Cmu%20%5Cneq%207.2)
So then the best option for this case would be:
H0: μ = 7.2 minutes Ha: μ ≠ 7.2 minutes
And in order to test the hypothesis we can use a one sample t test or z test depending if we know the population deviation or not
Answer:
I think it would be the addition property of equality
Step-by-step explanation:
Let's see what we know:
<span>
the car wash can wash 50 more cars per week at an average of $5 per
wash. The owner will pay the worker $9 per hour for 30 hours per week.
So, the total additional earnings for the car wash will be: 50*5=250 dollars.
But the additional costs, will be: 9*30=270
so it seems that the car wash would spend more than earn - not a good decision for business! so the correct answer is:
b. The owner will not hire the worker because the marginal costs of $270
per week are greater than the marginal benefits of $250 per week</span>
Answer:
The total change was 8*C
Step-by-step explanation:
If the unit rate is 2/1 ~2 degrees per every 1 hour~ than you would need to multiply 2 by the amount of hours given to get the total change in temperature, which would be 8*C.
Answer:95.62
Step-by-step explanation: