What is a polygon that connects with the bases of a polyhedron?

An automobile manufacturer claims that its car has a 28.0 miles/gallon (MPG) rating. An independent testing firm has been contra

d1i1m1o1n [39]

Answer:

The calculated value z = 1.3145 < 2.326 at 0.02 level of significance

The null hypothesis is accepted

Hence An automobile manufacturer claims that its car has a 28.0 miles/gallon (MPG) rating.

Step-by-step explanation:

Step(i):-

An automobile manufacturer claims that its car has a 28.0 miles/gallon (MPG) rating.

The mean of the Population 'μ' = 28.0miles/gallon

Given data after testing 270 cars, they found a mean MPG of 27.8. Assume the variance is known to be 6.25.

The sample size 'n' = 270

Mean of the sample 'x⁻' = 27.8

Given Population variance 'σ² = 6.25

The standard deviation of Population 'σ' = √6.25 = 2.5

Step(ii):-

Null hypothesis :H₀: 'μ' = 28.

Alternative hypothesis :H₁: 'μ' ≠28.

The test statistic

$Z = \frac{x^{-}-mean }{\frac{S.D}{\sqrt{n} } }$

$Z = \frac{27.8-28 }{\frac{2.5}{\sqrt{270} } } = \frac{-0.2}{0.15214}$

Z = -1.3145

|Z| = |-1.3145|= 1.3145

Step(iii):-

The tabulated value of z-score at 0.02 level of significance = 2.326

The calculated value z = 1.3145 < 2.326 at a t 0.02 level of significance

The null hypothesis is accepted

Hence An automobile manufacturer claims that its car has a 28.0 miles/gallon (MPG) rating.

8 0

4 years ago

Choose all the answers that apply. Todd drops three balls made of different materials to see how high they will bounce. He drops

iragen [17]

The independent variable is the type of material the balls are made from

6 0

3 years ago

What is the answer for -0.3x<6

Lorico [155]

Answer:

Divide each term in

0.3x<6 by 0.3 and simplify.

Inequality Form:

x<20

Interval Notation:(−∞,20)

Step-by-step explanation:

<h2>BRAINLIEST?</h2>

7 0

3 years ago

Im bored who tryna talk rn

olga55 [171]

ME but i have a math test sadly

7 0

3 years ago

Read 3 more answers

I beg help me finish this HW

erastovalidia [21]

Answer: The mixed number 16 1/3

Some books write this as 16 & 1/3 to help separate out the whole part (16) and the fractional part (1/3) better.

On paper, you'd write it as $16 \frac{1}{3}$

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Explanation:

The three angles mentioned (AOC, DOC, EOD) all combine to form a straight angle AOD = 180 degrees

So we can say,

(angle AOC) + (angle DOC) + (angle EOD) = angle AOD

(angle AOC) + (angle DOC) + (angle EOD) = 180

(7x-2) + (2x+8) + (27) = 180

7x-2 + 2x+8 + 27 = 180

(7x+2x) + (-2+8+27) = 180

9x+33 = 180

9x = 180-33 ... subtract 33 from both sides

9x = 147

x = 147/9 .... divide both sides by 9

x = 16.333333 .... use calculator here

The stuff to the left of the decimal (16) is the whole part

The decimal part 0.33333 where the 3's go on forever converts to 1/3

We can see this if we multiply 0.33333 with 9 getting 0.33333*9 = 2.99997

and that rounds to 3, so 3/9 = 1/3

In short, 16.333333 = 16 & 1/3

3 0

4 years ago