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SpyIntel [72]
3 years ago
10

HELP MATH QUESTIONS!! WILL MARK CORRECT ANSWERS BRAINLIEST!! 40 POINTS!! DUE TODAY ASAP!!

Mathematics
1 answer:
yuradex [85]3 years ago
3 0

Answer:

  1. f(x) = 34.59 +3.74x
  2. 0.96
  3. very strong
  4. 8.93

Step-by-step explanation:

1. The selection of answers offers a choice of positive or negative slope, a slope of about 4 or about 35, and y-intercepts from the same set of values.

If you consider a couple of points (at the ends of the domain is usually a good choice), you see the slope is about 4 and the y-intercept is around 30.

For example, the points (5, 50) and (15, 91) have a slope of (91-50)/(15-5) = 4.1 so will give rise to the equation ...

  y -50 = 4.1(x -5)

Filling in x=0 gives y = 50 -20.5 = 29.5

So, the nearest of the offered choices is ...

  f(x) = 34.59 +3.74x

Please note that no calculator is involved. We simply estimated the parameters of the regression line based on a couple of the data points. This estimate is sufficient to allow us to find the correct answer choice.

__

2. If we look at a few other data points, we see that they have a generally upward trend that matches the above equation pretty well. That suggests a very high value of correlation, so the appropriate choices would be 0.93 or 0.96. Of course, the correlation is positive, matching the sign of the slope of the regression line. (Since the data points do not fall exactly on a line, the correlation is not 1.00. My assessment is they fall close enough to the line to rate a correlation of .96 instead of .93.)

At this point, the output of your calculator can confirm that the correlation coefficient is closer to 0.96. Mine says r = 0.9624.

  r = 0.96

__

3. We have already determined by examining the data points that the correlation is "very strong." The correlation coefficient of 0.96 confirms this.

__

4. Using the equation of part 1, we can find the number of study hours:

  68 = 34.59 +3.74x

  (68 -34.59)/3.74 = x ≈ 8.933

We expect a score of 68 is associated with about 8.93 study hours.

_____

Please note that we have used very little calculation to determine the answers to this question. The only requirement is a general understanding of what linear regression and correlation coefficients mean.

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Vichy reads at a constant rate. She can read 5 pages
vagabundo [1.1K]

Answer:

p = (5t)/9

Step-by-step explanation:

 9 mins ---------- 5 pages

1 min -------------5/9 page

t mins ------------5/9 x t pages

Thus

p = (5t)/9

7 0
3 years ago
Cost of 1 almirah is=$2345<br>what is the cost of 12 such almirah?​
Dennis_Churaev [7]

Answer:

The answer is- Rs. 28,140

Step-by-step explanation:

The cost of 1 almirah is Rs. 2345

Therefore the cost of 12 such almirahs will be

= 2345 × 12

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<h2>Please mark me as brainliest</h2>
6 0
2 years ago
Read 2 more answers
Leroy borrowed P1500 at an annual simple interest rate of 12%. He paid P270 in interest. For what time period did Leroy borrow t
victus00 [196]

Answer:

C. 18 months

Step-by-step explanation:

Given data

Principal= P1500

rate= 12%

Simple interest= P270

We know that

Simple interest= PRT/100

substitute

270= 1500*12*T/100

cross multiply we have

270*100= 1500*12*T

27000= 18000 T

divide both sides by 18000

T= 27000/18000

T=1.5 years

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Math Stuff please help 6th grade quiz!!
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If a jet flies at a speed of 600 km/h, how many meters does it fly in 10 seconds? There are 1000 meters in 1 km.
nydimaria [60]
it flies 1666.67 meters in 10 seconds.
Speed = 600km/h
1km = 1000m
1hour = 3600 sec
convert speed in km/h to m/s
600 x 1000/3600 = 6000/36 = 166.667 m/s
Now this speed is for per sec, in 10 sec = 166.667 x 10 = 1666.67m
3 0
3 years ago
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