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lana [24]
3 years ago
12

For each of the following hypothetical studies, identify the primary caution each researcher should have when drawing conclusion

s about the relationship he or she found.
Sarah wants to determine the relationship between height and weight for high school students in the United States. She collects data on height, in inches, and weight, in pounds, for 75 randomly selected high school students in each state. She averages the values by state and performs a linear regression on the 50 state-level values. She finds a high positive linear correlation between height and weight
Mathematics
1 answer:
Citrus2011 [14]3 years ago
5 0

Answer:

Ecological correlation

Step-by-step explanation:

According to a different source, the options that come with this question are:

  • Ecological correlation
  • Extrapolation
  • Lurking variable
  • Influential observation

Sarah should be careful about the use of an ecological correlation. An ecological correlation describes two variables that are group means, as opposed to a correlation between two variables that describe individuals. In this case, Sarah did pick 75 random students in each state. However, she then obtained the height and weight means for each state, and proceeded to compare these. Therefore, Sarah is not comparing individual values, but means. It is important to notice this, because correlations at a group level can be much higher than those at the individual level.

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What is the y-intercept Of the function Represented by the table of values belowX -2 1 2 4 7 y 15 6 3 -3 -12
Kipish [7]

Given:

The table of values.

To find:

The y-intercept of the given function.

Solution:

The table of values represents a linear function because the rate of change is constant.

Consider any two points from the given table. Let the two points are (-2,15) and (1,6). Then the equation of the linear function is

y-y_1=\dfrac{y_2-y_1}{x_2-x_1}(x-x_1)

y-15=\dfrac{6-15}{1-(-2)}(x-(-2))

y-15=\dfrac{-9}{1+2}(x+2)

y-15=\dfrac{-9}{3}(x+2)

y-15=-3(x+2)

Adding 15 on both sides, we get

y=-3x-6+15

y=-3x+9

Putting x=0, we get

y=-3(0)+9

y=0+9

y=9

The y-intercept is 9. Therefore, the correct option is C.

8 0
3 years ago
Read 2 more answers
PLEASE HELP THIS IS A TEST
cluponka [151]

Answer:

C, F, and maybe D are correct.

Step-by-step explanation:

8 0
3 years ago
Michael lives in the northwest corner of Clark County. Clara
timama [110]

Answer:

About 0.41 hours

Step-by-step explanation:

THe distance between Michael and Clara is 44 km.

We know D = RT,

Where

D is distance

R is rate (speed)

T is time

For Michael, we can write:

D = 47t

For Clara, we can write:

D = 61t

If we let michael's distance be x, Clara's distance would be 44 - x

So, we can say:

x = 47t

and

44 - x = 61t

Putting first equation into 2nd, we get:

44 - 47t = 61t

SOlving:

44 - 47t = 61t

44 = 61t + 47t

44 = 108t

t = 44/108 = 0.41 hours

The commute took 0.41 hours

7 0
3 years ago
There are 22 events at an indoor track and field meet. The ratio of track and events to field events is 8:3. How many of the eve
Minchanka [31]
16 track and events and 6 events. Since if it is 8:3 that means the total is 11, and 22 is double 11. The ration would double in size. Making 8:3 to 16:6. If you add 16 and 6, you would get 22 in all.
3 0
3 years ago
Kate bought 3 packages of ground beef. The packages weighed 2.65 lb, 1.85 lb, and 2.46 lb. She divided the ground beef into 4 pa
GalinKa [24]

Answer:

1.74 lb

Step-by-step explanation:

2.65 + 1.85 + 2.46 = 6.96 ÷ 4 = 1.74

6 0
3 years ago
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