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3 years ago

Which graph has a y-intercept of -1/2?

Mathematics

1 answer:

Arturiano [62]3 years ago

7 0

Answer:

Step-by-step explanation:

Y-intercept basically means where on the graph does the line "cut" through the y-axis (the vertical line). In the graphs, there is only one line which cuts through the y-axis at -1/2, which is C. .

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An electronic store makes a profit of 25$ for every portable DVD player sold and $55 for every DVD recorder sold. The managers t

nasty-shy [4]

I believe it should be d

5 0

4 years ago

A copyeditor thinks the standard deviation for the number of pages in a romance novel is six. A sample of 25 novels has a standa

alina1380 [7]

Answer:

No, the standard deviation for number of pages in a romance novel is six only.

Step-by-step explanation:

First we state our Null Hypothesis, $H_o$ : $\sigma$ = 6

and Alternate Hypothesis, $H_1$ : $\sigma$ > 6

We have taken these hypothesis because we have to check whether our population standard deviation is higher than what editor hypothesized of 6 pages in a romance novel.

Now given sample standard deviation, s = 9 and sample size, n = 25

To test this we use Test Statistics = $\frac{(n-1)s^{2} }{\sigma^{2} }$ follows chi-square with (n-1) degree of freedom [ $\chi ^{2}_n__-1$ ]

Test Statistics = $\frac{(25-1)9^{2} }{6^{2} }$ follows $\chi ^{2}_2_4$ = 54

and since the level of significance is not stated in question so we assume it to be 5%.

Now Using chi-square table we observe at 5% level of significance the $\chi ^{2}_2_4$ will give value of 36.42 which means if our test statistics will fall below 36.42 we will reject null hypothesis.

Since our Test statistics is more than the critical value i.e.(54>36.42) so we have sufficient evidence to accept null hypothesis and conclude that our population standard deviation is not more than 6 pages which the editor hypothesized.

8 0

3 years ago

What is the value of X to the nearest tenth in the triangle below? the triangle is not drawn to scale

Semmy [17]

Answer:

x = 13.9

Step-by-step explanation:

With respect to the angle shown, we have the hypotenuse (the side opposite the 90 degree angle) and we have the adjacent side (which is the side labeled x). thus we can use the ratio "cosine" to solve this.

<em>The ratio of cosine is defined as:</em>

$Cos\theta=\frac{Adjacent}{Hypotenuse}$

Where adjacent and hypotenuse are the respective sides and $\theta$ is the angle

<em>Thus, we can now write:</em>

$Cos\theta=\frac{Adjacent}{Hypotenuse}\\Cos(35)=\frac{x}{17}\\Cos(35)*17=x\\x=13.9$

The first answer choice is right, x = 13.9

8 0

3 years ago

A weight-management researcher was interested in whether the size of breakfast could deter overall food consumption throughout t

Masja [62]

Answer:

The question is not correctly stated, here is the correctly stated question:

A weight-management researcher was interested in whether the size of breakfast could deter overall food consumption throughout the rest of the day. He creates two breakfast groups, a 350-calorie breakfast and a 750-calorie breakfast, assigns six participants to each group and tracks their total calories eaten in one day. Because of the detailed attention needed to accurately interview participants about their eating, he works with the high-calorie group and has his assistant interview the low-calorie group.

How many levels does the independent variable have in this study?

a. 1

b. 2

c. 6

d. It is impossible determine with the information given.

The correct answer is 2 (b)

Step-by-step explanation:

Variables are properties, of an experiment that take on different amount or values, unlike a constant that has one unchanging value assigned to it.

There are two kinds of variables; dependent and independent variables. Independent variables are variables that the scientist/experimenter has the power to manipulate at will. In our example, the independent variable is "the size of breakfast" because the experimenter chose by reason of will to either use 350-calories or 750- calories breakfast. While the dependent variables are variables whose outcomes are with respect to the change in the independent variable. The experiment is actually out to observe how the dependent variable plays out during the experiment. In our example, the dependent variable is "overall food consumption throughout the rest of the day". The outcome of the overall food consumption throughout the rest of the day is as a result of the size of breakfast taken.

Next, the independent variable can take on various levels, and the number of levels are the number of experimental conditions that the independent variables can take. In our example the independent variable (size of breakfast), was either 350-calories breakfast or 750-calories breakfast, hence it took 2 experimental conditions. Most of the time, 2 level independent variables are the independent and the control variables. For clarity, another example is; "a research to determine the effect of five kinds of body creams on the skin color after 2 years", the dependent variable is the skin color, while the independent variable is the type of cream and in this case there are five types of creams, hence the level of the independent variable is 5.

5 0

3 years ago

Lucy picked 45 green apples 15% of the apples were green how many apples did lucy pick

EleoNora [17]

The answer would be 20 apples.

8 0

3 years ago