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2 years ago

PLEASE HELP thank you very much

Mathematics

1 answer:

ziro4ka [17]2 years ago

3 0

Answer:

452.39

Step-by-step explanation:

6^2pie * 4 = 452.39

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In order to estimate the difference between the average hourly wages of employees of two branches of a department store, the fol

Julli [10]

Answer:

$0.071,1.928$

Step-by-step explanation:

Downtown Store North Mall Store

Sample size n 25 20

Sample mean $\bar{x}$ $9 $8

Sample standard deviation s $2 $1

$n_1=25\\n_2=20$

$\bar{x_1}=9\\ \bar{x_2}=8$

$s_1=2\\s_2=1$

$x_1-x_2=9-8=1$

Standard error of difference of means = $\sqrt{\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}}$

Standard error of difference of means = $\sqrt{\frac{2^2}{25}+\frac{1^2}{20}}$

Standard error of difference of means = $0.458$

Degree of freedom = $\frac{\sqrt{(\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}})^2}{\frac{(\frac{s_1^2}{n_1})^2}{n_1-1}+\frac{(\frac{s_2^2}{n_2})^2}{n_2-1}}$

Degree of freedom = $\frac{\sqrt{(\frac{2^2}{25}+\frac{1^2}{20}})^2}{\frac{(\frac{2^2}{25})^2}{25-1}+\frac{(\frac{1^2}{20})^2}{20-1}}$

Degree of freedom =36

So, z value at 95% confidence interval and 36 degree of freedom = 2.0280

Confidence interval = $(x_1-x_2)-z \times SE(x_1-x_2),(x_1-x_2)+z \times SE(x_1-x_2)$

Confidence interval = $1-(2.0280)\times 0.458,1+(2.0280)\times 0.458$

Confidence interval = $0.071,1.928$

Hence Option A is true

Confidence interval is $0.071,1.928$

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2 years ago

Many artists incorporate geometric shapes into their art. An artist wants to make a sculpture shaped like a cone with a height o

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Answer:D

Step-by-step explanation:

It’s D

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2 years ago

Write out the following proportions in words. 81/9 = 45/5

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What do you mean by in words?

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3 years ago

A checking account had the following activity over a 2-day period : a withdrawal of $35.47, a deposit of $92.63, and a service c

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The answer would be $119.10

174.13-90.50=83.63
83.63+35.47=119.1

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2 years ago

2. Find the absolute value of 6? |6|

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Step-by-step explanation:

|6| = 6 means the absolute value of 6 is 6.

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3 years ago

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