I need a little help please

An x-intercept is also known as a _____

djyliett [7]

An x-intercept is also known as a _____horizontal intercept_____

5 0

3 years ago

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Sales for a company were 3 million dollars more the second year than the first, and sales for the third year were doubled the sa

Sati [7]

Year 3 = 2s

Year 2 = 3 + x

Year 1 = x

s = second year

x = first year

2s = 26

s = 13

The second year they made 13 million

13 - 3 = 10

x = 10

They made 10 million the first year.

6 0

3 years ago

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Park officials make predictions of times to the next eruption of a particular geyser, and collect data for the errors (minutes

nalin [4]

Answer:

a) Null hypothesis: $\mu =0$

Alternative hypothesis: $\mu \neq 0$

b) t =-7.44

c) $p_v = 2*P(t_{98}$

d) Reject Null hypothesis. The is enough evidence to conclude that the mean prediction error is not equal to 0.

We reject the null hypothesis because the $p_v$ . So we can conclude that the difference is significantly different from 0 at 5% of significance.

Step-by-step explanation:

Assuming this output:

$t_{difference}=-0.395$

t(observed value) =-7.44

t(Critical value )= 1.984

DF = 98

p value (two tailed) < 0.0001

$\alpha =0.05$

a) What are the null and alternative hypothesis

Null hypothesis: $\mu =0$

Alternative hypothesis: $\mu \neq 0$

The reason is because the output says a bilateral test so for this case w eselect this option.

b) Identify the statistic

The correct formula for the statistic is given by:

$t=\frac{\bar X_1 -\bar X_2 -0}{\sqrt{(\frac{s^2_1}{n_1}+\frac{s^2_2}{n_2})}}$

Based on the output the calculated value its t =-7.44

c) Identify the p value

We have the degrees of freedom given 98

Based on the alternative hypothesis the p value is given by:

$p_v = 2*P(t_{98}$

d) State the final conclusion that addresses the original claim

Reject Null hypothesis. The is enough evidence to conclude that the mean prediction error is not equal to 0.

We reject the null hypothesis because the $p_v$ . So we can conclude that the difference is significantly different from 0 at 5% of significance.

4 0

3 years ago

The ratio of boys to girls in Mr.Greens class is 4 to 5. There are 8 boys in the class. How many girls in the class

Alex777 [14]

Answer:

10

Step-by-step explanation:

B/G = 4/5

8/G = 4/5 Multiply each side by 5

40/G = 4 Multiply each side by G

40 = 4G Divide each side by 4

G = 10

There are 10 girls in the class.

Check:

8/10 = 4/5

4/5 = 4/5

3 0

3 years ago

Find x if a =13 and C = 47 need help

MariettaO [177]

So you're using the Pythagorean theorem which is a^2 + b^2 = c^2... so if you dont have b you can manipulate the equation. That equation is c^2 - a^2= b^2, so you square 47 which is 2209 and then square 13 which is 169... you do 2209-169 and that equals 2040, then you do the square root of that which is 45.166359 that can be simplified to 45 or two decimal points 45.167. Hope that Helped! :)

7 0

3 years ago