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3 years ago

Please help. Will mark brainliest!!

Mathematics

1 answer:

kipiarov [429]3 years ago

6 0

Answer: A:3 ÷ 1/4=3/4

Step-by-step explanation:

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A real-estate company appraised the market value of 36 homes in Lyttelton and found that the sample mean and standard deviation

pantera1 [17]

Solution :

Sample size Sample mean Sample S.D.

Sample 1 $n_1=36$ $\bar{x}_1=150,000$ $s_1=17,000$

Sample 2 $n_2=45$ $\bar{x}_2=100,000$ $s_2=12,000$

$df = \frac{\left(\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}\right)^2}{\frac{1}{n_1-1}\left(\frac{s_1^2}{n_1}\right)^2+\frac{1}{n_2-1}\left(\frac{s_2^2}{n_2}\right)^2}$

= 60

Therefore, significance level, α = 0.1

Critical value, t* = 1.6706

So, the margin of error, $t^*=\sqrt{\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}}$

= 559.9896

Lower limit, $(\bar x_1-\bar x_2)-\text{(margin of error)}=44402.0104$

Upper limit, $(\bar x_1-\bar x_2)+\text{(margin of error)}=55597.9896$

Therefore 90% C.I. is (44402.0104, 55597.9896) or $44402.0104 < \mu_1 - \mu_2 < 55597.9896$

5 0

3 years ago

The regular price of a color tv is 559.45. during a sale, hill tv is selling the tv for 457.41. Determine the percent decrease i

Lena [83]

Answer:

478

Step-by-step explanation:

559.45-457.41=102.04

102.04/559.45*100

approximately 478

5 0

4 years ago

The graph below represents which of the following functions?

Paladinen [302]

Answer:

hiuu ui9i io9

Step-by-step explanation:

iu9uj k

7 0

3 years ago

Please help me with this math question T-T

Arisa [49]

1400000000000000000000000

5 0

3 years ago

Find the slope and the y-intercept line

BaLLatris [955]

Answer:

Step-by-step explanation:

slope=2/3

y=2/3 x

or y=2/3 x+0

y -intercept=0

3 0

3 years ago