I don’t know what property to use

Write 2.14 in word form

Vesna [10]

Answer:

two dollars and fourteen cents

Step-by-step explanation:

4 0

3 years ago

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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

7 0

3 years ago

Two rainstorms occurred in one week. First storm 15 mL of rain fell per hour. Second storm 30 mL of rain fell per hour. The rain

sergeinik [125]

Answer:

The answer to your question is the first rain lasted 40 hours and the second rain lasted 30 hours.

Step-by-step explanation:

Data

1st 15 ml/h = x

2nd 30 ml/h = y

Total time = 70 h and 1500 ml

1.- Write 2 equations

First rain + second rain = 70 h

x + y = 70 (I)

15x + 30 y = 1500 (II)

2.- Solve equations by elimination

Multiply first equation by -15

-15x - 15y = - 1050

15x + 30y = 1500

0x + 15y = 450

y = 450 / 15

y = 30 h

x + 30 = 70

x = 70 - 30

x = 40 h

3.- Conclude

The first rain lasted 40 h and the second rain lasted 30 h.

3 0

4 years ago

Please help I could really really use it I'm a little confused on this

elena-14-01-66 [18.8K]

1 to the ninth power can be represented by

1•1•1•1•1•1•1•1•1

1 times any number or put to any power will always be one.

Hope this helped.

7 0

3 years ago

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PLS HELP ASAP WILL GIVE BRAINLIEST

JulsSmile [24]

This is for A part A: It shows that the least amount is 37.5 minutes

It shows the most amount of time is 60 minutes

One thing it does not show is how many students where in the class.

3 0

3 years ago