given that the ability of auto mechanics to identify simple engine problems, an automobile with a single suchproblem was taken to 72 different car repair facilities.

Sample proportion $= 42/72=0.5833$

Set up hypotheses as

H0: p =0.75

Ha: p < 0.75

(Left tailed test)

Assuming H0 to be true, std error of proportion = $\sqrt{\frac{0.75*0.25}{72} } \\=0.0668$

p difference = -0.1667

Test statistic Z = p diff/std error = -2.50

p value = 0.0062

since p is less than0.05 at 5% significance level we reject null hypothesis

The proportion is less than 0.75 only

6 0

3 years ago

write an equation that represents the proportional relationship between oil and vinegar explain the meaning of the point

Kitty [74]

To write and equation we call y=oil and x=vinager, so:

$\begin{gathered} y=k\cdot x \\ \text{Where k is some constant of proportionality} \end{gathered}$

To find the constant k we can use the point in the picture (vinager, oil) = (x, y) = (1, 1.5), so:

$\begin{gathered} x=1,y=1.5 \\ 1.5=k\cdot1\Rightarrow k=1.5 \end{gathered}$

So, the equation is:

$y=1.5x$

Now, the meaning of the point (1, 1.5) is for 1 amount of vinager you need 1.5 amount of oil.

6 0

1 year ago

Mary leaves her house to take a walk. In the graph shows the distance d in feet from her house that Mary is at any given time t

Nezavi [6.7K]

Is that all that asks in the question

5 0

3 years ago

You can convert a temperature given in degrees Celsius to Fahrenheit temperature by using the expression 9x ÷ 5 + 32, where x is

Minchanka [31]

Water freezes at 32 degree Fahrenheit.

Step-by-step explanation:

Given,

Formula for Celsius to Fahrenheit = $\frac{9}{5}x+32$

x = Celsius temperature

Boiling point of water = 0°C

We will put x=0

0°C = $\frac{9}{5}(0)+32$

0°C = 0+32

0°C = 32 degree Fahrenheit

Water freezes at 32 degree Fahrenheit.

Keywords: temperature, addition

Learn more about temperature at:

#LearnwithBrainly

4 0

3 years ago