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Brrunno [24]
3 years ago
14

In a sample of 138 tables, the average height was found to be 32.6in. with a variance of 2.8. Give a point estimate for the popu

lation variance of the height of the tables. Round your answer to two decimal places, if necessary. Answer
Mathematics
1 answer:
vesna_86 [32]3 years ago
5 0

Answer:

\hat{\sigma}^2 = 2.8  

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 138

Average = 32.6 inch

Population variance,

\sigma^2 = 2.8

We have to find a point estimate for the population variance of the height.

The point estimate for the population variance is the population variance itself.

\hat{\sigma}^2 = \sigma^2 = 2.8

Thus, the point estimate of population variance is the population variance that is 2.8.

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How quickly do synthetic fabrics such as polyester decay in landfills? A researcher buried polyester strips in thes oil for diff
ad-work [718]

Answer:

no enough evidence to draw up a conclusion

Step-by-step explanation:

Data:

let: \mu _{1} = decay after 2 weeks

    \mu _{2} = decay after 16 weeks

Making the hypotheses:

Null hypothesis; H_{o} = \mu _{1}  - \mu _{2} = 0

the deviation = 0.05

the standard difference  = 4

Conditions:

The normal distribution curve can be plotted on a graph and the plot shows that the distribution is a skewed distribution.

Then,

t = \frac{(123.8-16.4)-0}{\sqrt{\frac{4.6^{2} }{5}+\frac{16.09^{2} }{5}   } } \\  = 0.989

Therefore, it can be concluded that 0.1983 > 0.05. This presents our failure to reject the null hypothesis.

Thus, there is not enough evidence to conclude that polyester decays more in less than 2 weeks.

5 0
3 years ago
What is the percentage of lemons in the is group of lemons and strawberries?
Vitek1552 [10]

Answer:

70%  

Step-by-step explanation:

60 - Altogether

18 - Strawberries

42 - Lemons

42/60 = 0.7

0.7 x 100 = 70%

8 0
2 years ago
Read 2 more answers
Ill give Brainliest!!!!!
Rus_ich [418]

Answer: The mass of solid a is 4800 grams

Step-by-step explanation:

Hi, to answer this question we have to apply proportions:

For solid b = 40.32 cm2 / 6912 grams

For solid a = 28 cm2 / x grams

Where x is the mass of solid a.

So:  

40.32 / 6912 = 28 / x  

x = 28 / (40.32 / 6912)

x = 4800 grams

The mass of a is 4800 grams

Feel free to ask for more if needed or if you did not understand something.

8 0
3 years ago
Read 2 more answers
Find the surface area of the prism L=13 W=7 H=4
Wewaii [24]

Answer:

342 units squared

Step-by-step explanation:

since this is a rectangular prism, all we have to do is multiply the values by one of the other values once and multiply that by 2

6 0
3 years ago
3 cm and 9 mm converted completely into centimetres to one decimal place is ____cm. Someone please help me it would be greatly a
makvit [3.9K]
9mm in centimeters is 0.9
3 0
2 years ago
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