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zepelin [54]
3 years ago
15

A researcher is gathering data to design a wearable device that measures heart rate from the wrist. He/She took wrist measuremen

ts from 10 people to determine what the average wrist size should be for said wearable device. The mean and standard deviation of 10 wrist measurements were calculated to be: Mean, (inches) i = 7.838 Standard | Deviation, Sx Sx = 0.844 Number of samples (n) 10 Determine a 99% confidence interval for the mean presented above. (Use the appropriate table)

Mathematics
1 answer:
shusha [124]3 years ago
3 0

Answer: 99% Confidence interval = 6.97, 8.706

Step-by-step explanation: Please find the attached document for the step by step explanation

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Find the equation of the line that is parallel to the graph of 2x-7y=8 and passes through (-1,-1)
USPshnik [31]
Solve for y
-7y = -2x + 8
y = (2/7)x - 8/7

A parallel line has the same slope as the given line. The slope of the given line is (2/7)
 
y = (2/7) x + b Now we have to find b using (-1,-1). When x = - 1 so does y
-1 = ( 2/7)*(-1) + b
-1 + 2/7 = b
b = - 5/7

The line is 
y = (2/7)x - 5/7

7 0
3 years ago
The radius of a spherical ball is measured at r = 25 cm. Estimate the maximum error in the volume and surface area if r is accur
natulia [17]

Answer:

Volume = 2384.582 cm^3

Surface Area = 189.626 cm^2

Step-by-step explanation:

With the accuracy of r within 0.6 cm minimum & maximum values are 25-0.3 and 25+0.3 respectively.

Taking r = 25 cm

Volume = (4/3)*Pi*R3 = 65449.847

Surface Area = 4*Pi*R2 = 7853.982

The minimum possible values for Volume and surface area would be:

if r = 24.7 cm

Volume = (4/3)*Pi*R3 = 63121.814 cm^3

Surface Area = 4*Pi*R2 = 7666.617 cm^2

The maximum possible values for Volume and surface area would be:

if r = 25.3 cm

Volume = (4/3)*Pi*R3 = 67834.429 cm^3

Surface Area = 4*Pi*R2 = 8043.608 cm^2

Error from Minimum values:

Volume = 2328.033 cm^3

Surface Area = 187.365 cm^2

Error from Maximum values:

Volume = 2384.582 cm^3

Surface Area = 189.626 cm^2

3 0
3 years ago
(3n4 + 6n + 6n)– (n+4n4 + 7n)
Oksi-84 [34.3K]

Answer:

-n⁴ + 4n

Step-by-step explanation:

Step 1: Write expression

(3n⁴ + 6n + 6n) - (n + 4n⁴ + 7n)

Step 2: Combine like terms

3n⁴ + 12n - (4n⁴ + 8n)

Step 3: Distribute -1

3n⁴ + 12n - 4n⁴ - 8n

Step 4: Combine like terms

-n⁴ + 4n

7 0
3 years ago
Read 2 more answers
Is anybody better at this then I am ?
lbvjy [14]

Answer:

hmmm

Step-by-step explanation:

8 0
3 years ago
Line Q is parallel to the line represented by the equation 5x – 4y = 10. Line Q passes through the point (12, –7). Which linear
marysya [2.9K]
A, plug in 12 for x and -7 for y to get you’re answer
3 0
2 years ago
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