We will develop a Hypothesis Test ( a 2 tail test since the independent testing firm is interested in finding out if there is an incorrect MPG rating from the manufacturer

Test Hypothesis :

Null hypothesis H₀ μ = μ₀

Alternative Hypothesis Hₐ μ ≠ μ₀

Significance Level α = 0,05 α/2 = 0,025

z(c) for α/2 from z-table z(c) = - 1, 96 and by symmetry z(c) = 1,96

Calculating z(s)

z(s) = ( μ - μ₀ ) / σ /√n

z(s) = ( 37,8 - 37,4 ) / 2,3 /√280

z(s) = 0,4 * 16,73 / 2,3

z(s) = 2,90

Comparison between z(c) and z(s)

z(s) > z(c) 2,90 > 1,96

Then z(s) is out of the acceptance region, we reject H₀, doubts of the independent testing firm are valids

8 0

2 years ago

Calculate the circumference. round to the nearest hundredth. 16 inches

goldenfox [79]

Given the radius is, r = 16 in,

The expression for the circumference of a circle is,

$C=2\pi r$

Therefore, we have,

$C=2\times3.14\times16\text{ in = }100.48\text{ in}$

Thus, the circumference of the circle is 100.48 in.

6 0

11 months ago

Plz help i will mark brainliest

Alexus [3.1K]

2,3,and4 is 72
1 and 5 is 36

5 0

2 years ago