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mihalych1998 [28]

3 years ago

5

On a recent survey, 60% of those surveyed indicated that they preferred taking a trip to the beach over a trip to the mountains.

If 810 people preferred a trip to the mountains, how many people were surveyed?
Question 1 options:

486

870

1,350

2,025

2 answers:

tankabanditka [31]3 years ago

6 0

The third one , 870

Lostsunrise [7]3 years ago

3 0

Answer:

Its Option three, 1,350.

Step-by-step explanation:

60% of 1350 is 810.

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an oil spreads 25 square meters every 10 minutes. how much area will the oil spill cover after 1 hour?

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3 years ago

Point T' has coordinates (-3, 4). If it was translated up 3 units, what were the coordinates of its pre-image?

MrMuchimi

Translation refers to a rigid motion or transformation where you move an object from one location to another.
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In this exercise it is asked you to find the coordinates of the preimage of point T', which has the coordinates (-3,4) and is the effect of a translation of 3 units up. As previous said, the words up and down represent a change on the y-axis, meaning that the y-coordinate is the one that should be changed.

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6 0

3 years ago

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A statistics practitioner in a large university is investigating the factors that affect salary of professors. He wondered if ev

Ulleksa [173]

Answer:

Step-by-step explanation:

Hello!

Given the linear regression of Y: "Annual salary" as a function of X: "Mean score on teaching evaluation" of a population of university professors. It is desired to study whether student evaluations are related to salaries.

The population equation line is

E(Y)= β₀ + β₁X

Using the information of a n= 100 sample, the following data was calculated:

R²= 0.23

Coefficient Standard Error

Intercept 25675.5 11393

x 5321 2119

The estimated equation is

^Y= 25675.5 + 5321X

Now if the interest is to test if the teaching evaluation affects the proffesor's annual salary, the hypotheses are:

H₀: β = 0

H₁: β ≠ 0

There are two statistic you can use to make this test, a Student's t or an ANOVA F.

Since you have information about the estimation of β you can calculate the two tailed t test using the formula:

$t= \frac{b - \beta }{\frac{Sb}{\sqrt{n} } }$ ~ $t_{n-2}$

$t= \frac{ 5321 - 0 }{\frac{2119}{\sqrt{100} } }$ = 25.1109

The p-value is two-tailed, and is the probability of getting a value as extreme as the calculated $t_{H_0}$ under the distribution $t_{98}$

p-value < 0.00001

I hope it helps!

3 0

3 years ago