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ludmilkaskok [199]
3 years ago
11

F(x)= x squared + 6x + 8

Mathematics
1 answer:
defon3 years ago
4 0

Answer: (x+4) (x+2)

Step-by-step explanation:

x^2 + 2x + 4x +8

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A public bus company official claims that the mean waiting time for bus number 14 during peak hours is less than 10 minutes. Kar
ch4aika [34]

Answer:

We conclude that the mean waiting time is less than 10 minutes.

Step-by-step explanation:

We are given that a public bus company official claims that the mean waiting time for bus number 14 during peak hours is less than 10 minutes.

Karen took bus number 14 during peak hours on 18 different occasions. Her mean waiting time was 7.8 minutes with a standard deviation of 2.5 minutes.

Let \mu = <u><em>mean waiting time for bus number 14.</em></u>

So, Null Hypothesis, H_0 : \mu \geq 10 minutes      {means that the mean waiting time is more than or equal to 10 minutes}

Alternate Hypothesis, H_A : \mu < 10 minutes    {means that the mean waiting time is less than 10 minutes}

The test statistics that would be used here <u>One-sample t test statistics</u> as we don't know about the population standard deviation;

                       T.S. =  \frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }  ~ t_n_-_1

where, \bar X = sample mean waiting time = 7.8 minutes

             s = sample standard deviation = 2.5 minutes

             n = sample of different occasions = 18

So, <u><em>test statistics</em></u> =  \frac{7.8-10}{\frac{2.5}{\sqrt{18} } }  ~ t_1_7

                              =  -3.734

The value of t test statistics is -3.734.

Now, at 0.01 significance level the t table gives critical value of -2.567 for left-tailed test.

Since our test statistic is less than the critical value of t as -3.734 < -2.567, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which <u>we reject our null hypothesis</u>.

Therefore, we conclude that the mean waiting time is less than 10 minutes.

5 0
3 years ago
i loves chick-fil-a i have 12$ in my pocket if the chicken sandwich are 2.25$ each how many chicken sandwiches can i buy
Helen [10]

Answer:

You can buy atleast 5 chicken sandwiches! (12 / 2.25 is 5.33333 (repeating))

6 0
2 years ago
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Ok soo the answer for part A is 714 euros B idk
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Question 7 of 40
Irina-Kira [14]

Answer:

12

Step-by-step explanation:

5 0
1 year ago
Daniella is interviewing for a job. She wants her take-home pay to be at least $51,000. What is the least salary she can earn if
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$43,350 tirando os 15% dos impostos.

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