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Solnce55 [7]
3 years ago
11

How do you tell if a number is divisible by three

Mathematics
2 answers:
Troyanec [42]3 years ago
8 0
Try to divide it by 3
9966 [12]3 years ago
5 0
There won't be any reminder.
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The average local cell phone call length was reported to be 2.27 minutes. A random sample of 20 phone calls showed an average of
Afina-wow [57]

Answer:

Yes, at α = 0.05 it can be concluded that the average differs from the population average.

Step-by-step explanation:

We are given that the average local cell phone call length was reported to be 2.27 minutes. A random sample of 20 phone calls showed an average of 2.98 minutes in length with a standard deviation of 0.98 minutes.

<em>Let </em>\mu<em> = population average local cell phone call length</em>

SO, Null Hypothesis, H_0 : \mu = 2.27 minutes  {means that the average is same as that of population average}

Alternate Hypothesis, H_a : \mu \neq 2.27 minutes  {means that the average differs from the population average}

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

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

where, \bar X = sample average call length = 2.98 minutes

            s = sample standard deviation = 0.98 minutes

            n = sample of phone calls = 20

So, <em><u>test statistics</u></em>  =  \frac{2.98-2.27}{\frac{0.98}{\sqrt{20} } }  ~ t_1_9

                               =  <u>3.24</u>

Now, at 0.05 level of significance the t table gives critical values between -2.093 and 2.093 at 19 degree of freedom for two-tailed test. Since our test statistics does not lie within these range of critical values so we have sufficient evidence to reject our null hypothesis as test statistics will fall in the rejection region.

Therefore, we conclude that the average differs from the population average.

6 0
3 years ago
Can anyone figure this out???
Anestetic [448]
It’s a right triangle because it has a 90 degree angle
5 0
3 years ago
Read 2 more answers
The area of a right triangle is 16 square
statuscvo [17]

Answer:

Well if it volume it would be 16 × 2 which is 32 then that would 32 × 16=512

but you wrote area so it would be 16

6 0
3 years ago
The diameter of the circle above is 32 in. What is the circumference of the circle? Use = 3.14.
KonstantinChe [14]

Answer:

8.3776 this is the circumference

Step-by-step explanation:

4 0
3 years ago
Which statements (more than one) describe the equation 3 x 9 = 27?
denis-greek [22]

Answer:

9 times as many as 3 is 27.

Step-by-step explanation:

6 0
2 years ago
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