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yuradex [85]
2 years ago
15

If y^3=64,what is y?

Mathematics
1 answer:
monitta2 years ago
3 0

Answer:

y=4

Step-by-step explanation:

needs to be 20 characters looong lol

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An experiment to investigate the survival time in hours of an electronic component consists of placing the parts in a test cell
mixer [17]

Answer:

a) The sample mean is of 49 and the sample standard deviation is of 11.7.

b) The range of the true mean at 90% confidence level is of 9.62 hours.

c) The prediction interval, at a 90% confidence level, of it's failure time is between 39.38 hours and 58.62 hours.

Step-by-step explanation:

Question a:

Sample mean:

\overline{x} = \frac{34+40+46+49+61+64}{6} = 49

Sample standard deviation:

s = sqrt{\frac{(34-49)^2+(40-49)^2+(46-49)^2+(49-49)^2+(61-49)^2+(64-49)^2}{5}} = 11.7

The sample mean is of 49 and the sample standard deviation is of 11.7.

b)Determine the range of the true mean at 90% confidence level.

We have to find the margin of error of the confidence interval. Since we have the standard deviation for the sample, the t-distribution is used.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 6 - 1 = 5

90% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 5 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.9}{2} = 0.95. So we have T = 2.0.150

The margin of error is:

M = T\frac{s}{\sqrt{n}}

In which s is the standard deviation of the sample and n is the size of the sample. So

M = 2.0150\frac{11.7}{\sqrt{6}} = 9.62

The range of the true mean at 90% confidence level is of 9.62 hours.

(c)If a seventh sample is tested, what is the prediction interval (90% confidence level) of its failure time.

This is the confidence interval, so:

The lower end of the interval is the sample mean subtracted by M. So it is 49 - 9.62 = 39.38 hours.

The upper end of the interval is the sample mean added to M. So it is 49 + 9.62 = 58.62 hours.

The prediction interval, at a 90% confidence level, of it's failure time is between 39.38 hours and 58.62 hours.

4 0
2 years ago
In the number 2145857, how does the digit 5 in the thousands place compare to the digit 5 in the tens place?
fgiga [73]
It is 1,000 bigger than the one in the tens place. 5,000 compared to 50 
7 0
3 years ago
Which is a graph of a proportional relationship?
hoa [83]

Answer:

bottom left graph

Step-by-step explanation:

A proportional relationship is linear, represented by a straight line graph passing through the origin.

The graph on the bottom left is straight line passing through the origin.

7 0
3 years ago
Explain the meaning of 0 for a Celsius thermometer
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The freezing point of water.
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Determine the equation of the inverse of y = 7x + 2
lukranit [14]

Answer:

x=7y+2

Step-by-step explanation:

switch the letters

7 0
3 years ago
Read 2 more answers
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