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2 years ago

How do I answer other people’s questions

Mathematics

2 answers:

laila [671]2 years ago

7 0

U click there question and then glick answer

iris [78.8K]2 years ago

3 0

Click the answer button under there question

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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

Step(ii):-

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

Conclusion:-

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

7 0

2 years ago

Simplify the expression. (–5 – c)(–1) A.5 + c B.–5 + c C.5 – c D.–5 – c

Marina86 [1]

-1(-5 - c) = 5 + c <==

6 0

3 years ago

Read 2 more answers

Y=3 - 2x 3x + 4y = 1

PolarNik [594]

Answer:

{y,x} = {17/2,-11}

Step-by-step explanation:

7 0

3 years ago

X + 2y = 7 3x - 2y = -3

VladimirAG [237]

Use Subtraction

1. Subtract
x+2y=7
3x-2y=-3
-------------
4x+0y=4 SIMPLIFY 4x=4

2. DIVIDE

4x=4
x=1

Substitute that into either of the original equations to get x=1, y=3

4 0

3 years ago

The calculated average of a data set best describes which of the following? (4 points) Group of answer choices Mean Median Mode

OleMash [197]

Answer:

Its A: Mean

Step-by-step explanation:

Mean means average in a set of data

8 0

2 years ago