Ask question

Ask question

All categories

3 years ago

6

Sally goes on a hike. The distance she walks compared to the amount of time she walks is shown on the graph. Which statement is

not true?

1 answer:

Likurg_2 [28]3 years ago

3 0

Need the graph...
please find a wa to give the graph and i can help

You might be interested in

The dwarves of the Grey Mountains wish to conduct a survey of their pick-axes in order to construct a 99% confidence interval ab

Dmitry_Shevchenko [17]

Answer:

The minimum sample size needed is 125.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

For this problem, we have that:

$\pi = 0.25$

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

What minimum sample size would be necessary in order ensure a margin of error of 10 percentage points (or less) if they use the prior estimate that 25 percent of the pick-axes are in need of repair?

This minimum sample size is n.

n is found when $M = 0.1$

So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.1 = 2.575\sqrt{\frac{0.25*0.75}{n}}$

$0.1\sqrt{n} = 2.575{0.25*0.75}$

$\sqrt{n} = \frac{2.575{0.25*0.75}}{0.1}$

$(\sqrt{n})^{2} = (\frac{2.575{0.25*0.75}}{0.1})^{2}$

$n = 124.32$

Rounding up

The minimum sample size needed is 125.

5 0

4 years ago

I'm thinking of a number. It is either more than 19 or less than 13.

Nostrana [21]

Answer:

is this a trick question?

3 0

3 years ago

How do you Simplify this expression in algebra?<br><br> 9x + 2x (5 + 4) - 2(5x + 4x)

Minchanka [31]

One can solve this by first using order of operations, and then combining like terms.

First is parenthesis

9x + 2x(9) - 2(9x)

Now we do the multiplication

9x + 18x - 18x

Now we combine like terms

9x

3 0

3 years ago

Line ab contains the points a(-2,3) and b(4,5). Line ab has a slope that is

gayaneshka [121]

Given two points $A = (A_x, A_y),\ B = (B_x,B_y)$ , the slope of the line passing through the two points is

$m = \dfrac{A_y-B_y}{A_x-B_x}$

So, in your case, you have

$m = \dfrac{3-5}{-2-4} = \dfrac{-2}{-6} = \dfrac{1}{3}$

5 0

3 years ago

What is the value of the 35th term in the sequence -15, -11, -7, ...?

madam [21]

It should be 121, or +4 or -4 from that. But I am pretty sure it is 121

6 0

3 years ago