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3 years ago

Look at picture for question. will mark brainilest please

Mathematics

2 answers:

vivado [14]3 years ago

6 0

Answer:

b. 3 pounds

.............

aivan3 [116]3 years ago

6 0

The answer is 7 since range is biggest number minus the smallest so 15-8=7

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City health officials will conduct a two-sample t-test for a difference in means to investigate whether

Anvisha [2.4K]

Answer:

The calculated value t = 2.366 > 2.0301 at 0.05 level of significance

The null hypothesis is rejected

There is a difference between the means

Step-by-step explanation:

Step(i):-

Given that the first sample size 'n₁' = 22

Given that the mean of the first sample x₁⁻ = 120

Given that the standard deviation of the sample (s₁) = 20

Given that the mean of the second sample x₂⁻ = 100

Given that the standard deviation of the second sample (S₂) = 30

Step(ii):-

T-test statistic

$t = \frac{x^{-} _{1} -x^{-} _{2} }{\sqrt{S^{2} (\frac{1}{n_{1} }+\frac{1}{n_{2} } ) } }$

where

$S^{2} = \frac{n_{1} S_{1} ^{2}+n_{2} S_{2} ^{2} }{n_{1} +n_{2}-2 }$

$S^{2} = \frac{22( 20)^{2}+ 15(30) ^{2} }{22 +15-2 }$

S² = 637.1428

S = √637.1428 = 25.24168

The standard deviation of the sample 'S' = 25.24168

Step(iii):-

Null Hypothesis:H₀:

There is no difference between the means

Alternative Hypothesis:H₁:

There is a difference between the means

T-test statistic

$t = \frac{x^{-} _{1} -x^{-} _{2} }{\sqrt{S^{2} (\frac{1}{n_{1} }+\frac{1}{n_{2} } ) } }$

$t = \frac{ 120 -100 }{\sqrt{637.14 (\frac{1}{22 }+\frac{1}{15 } ) } }$

t = 2.366

Degrees of freedom

γ = n₁+n₂ -2 = 22+15-2 = 35

t₀.₀₅ = 2.0301

The calculated value t = 2.366 > 2.0301 at 0.05 level of significance

The null hypothesis is rejected

There is a difference between the means

3 0

3 years ago

Read 2 more answers

Help Will Give Brainlist

Olin [163]

Answer:

3.14 million

Step-by-step explanation:

10.676 - 7.536 = 3.14

To check

7.536 + 3.14 = 10.676

4 0

3 years ago

G(t)=(t−7)(t+6) What is the domain of gg?

Oxana [17]

Answer:

All Real Numbers

Step-by-step explanation:

g(t) = (t − 7)(t + 6)

= t^2 - t - 42

This is a parabola which opens upwards.

The domain is All Real Numbers

5 0

3 years ago

Which of the following is the correct ratio for converting kilograms to grams

Brrunno [24]

Answer:

1000 Grams : 1 Kilogram or 1 Kilogram : 1000 Grams

Step-by-step explanation:

In the metric system the value of a kilogram is solved like:

$Kg = \frac{g}{1000}$

When converting from grams to kilograms, we solve it like:

$g = \frac{kg}{0.0010000}$

Let's take for example:

2 KG is how many grams?

We use the grams to kilograms formula like so:

$g = \frac{2}{0.0010000}$

Then we end up with:

g = 2000

6 0

3 years ago

Integers 53 + (-26 )

-BARSIC- [3]

<h2>✨ Question ✨</h2>

53 + (-26 )

<h2>✨ Answer ✨</h2>

$\: \: \: \: \: \: \: \: \: \purple{ \boxed{ \boxed{ \huge{ \tt{ \: 37 \: }}}}}$

6 0

3 years ago