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alina1380 [7]
2 years ago
11

Twice the sum of 15 and a number

Mathematics
2 answers:
pashok25 [27]2 years ago
7 0
2(15+N)
 
replace a number by N 

replace the sum of 15 and N by (15+N)

and lastly, replace twice by 2 

So your answer is 2(15+N)


Degger [83]2 years ago
7 0
Youre answer is 2(15+n)
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A recent study focused on the number of times men and women send a Twitter message in a day. The information is summarized below
jok3333 [9.3K]

Answer:

The value of the test statistic = 2.58

Test statistic Z = - 4.805

|Z| = 4.805 > 2.58

Null hypothesis is rejected The value of the test statistic = 2.58

There is  significant difference between in the mean number of times men and women send a Twitter message in a day

Step-by-step explanation:

Step(i):-

Sample size of men  n₁ = 25

mean of the first sample x₁⁻ = 20

Standard deviation of the first sample σ₁ = 5

Sample size of women n₂ = 30

mean of the second sample x₂⁻ = 30

Standard deviation of the first sample σ₂ = 10

Level of significance ∝= 0.01

<u>Step(ii)</u>:-

Null Hypothesis : H₀: There is no significant difference between in the mean number of times men and women send a Twitter message in a day

Alternative Hypothesis :H₁:There is  significant difference between in the mean number of times men and women send a Twitter message in a day

Test statistic

Z = \frac{x^{-} _{1} - x^{-} _{2} }{\sqrt{\frac{S.D_{1} ^{2} }{n_{1} }+\frac{ S.D_{2} ^{2}}{n_{2} }  } }

Z = \frac{20 - 30 }{\sqrt{\frac{(5)^{2}  }{25 }+\frac{ (10)^{2}  }{ 30}  } }

Z =  \frac{-10}{2.081} = - 4.805

The value of the test statistic = 2.58 C

|Z| = 4.805 > 2.58

Null hypothesis is rejected The value of the test statistic = 2.58

<u>Conclusion:</u>-

There is  significant difference between in the mean number of times men and women send a Twitter message in a day

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You need to add the dimensions
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3 years ago
If you earn $15 an hour and you work 35 hours a week, how much do you earn a month?
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2 years ago
Which inequality can be used to represent a number x that is less than equal to 8 and greater than -3
KIM [24]

Answer:  x =  -2,-1, 0, 1, 2, 3, 4, 5, 6, 7, 8

Solution:

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