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Scrat [10]
4 years ago
9

An article reported that for a sample of 41 kitchens with gas cooking appliances monitored during a one-week period, the sample

mean co2 level (ppm) was 654.16, and the sample standard deviation was 165.74. (a) calculate and interpret a 95% (two-sided) confidence interval for true average co2 level in the population of all homes from which the sample was selected. (round your answers to two decimal places.)
Mathematics
2 answers:
eduard4 years ago
8 0
<span>- x ± zά/2x s/âšn Here zά/2= z0.05/2= 1.96 Substitute the values we have 654.16 ± 1.96 x 164.43/âš41 =(603.83, 704.49)</span>
tester [92]4 years ago
7 0

Given:

Mean of 654.16

Sample size is 41

Standard dev is 165.74

Alpha is 1 – 0.95, Z(0.025) = 1.96

So the computation would be:

Mean ± Z* s/sqrt (n)

= 654.16 ± 1.96*165.74/sqrt(41)

= 654.16 ± 1.96*25.88

= 654.16 ± 50.7248

= 603.4352, 704.8848 is the confidence interval

Interpretation: We are 95% confident that this confidence interval contains the true pop. mean

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Andre tried to solve the equation 1/4(x + 12) = 2. What was his mistake? *
Umnica [9.8K]

Answer:

x=-4

Step-by-step explanation:

x+12=8    

x=8-12

Andre did not multiple both by four to get the exact whole number. He also, didnt subtract 12 which is not possible due to it being multiplied by 1/4.

5 0
3 years ago
Mrs.Fernandez must drive 6 1/9 miles to work every day. How many miles will Mrs.Fernandez have driven after 12 days of work?
Serjik [45]
Well since we know that for one day Mrs. Fernandez drives 6 and 1/9 miles to work what could we do to get 12 days of work driven.
all we have to do here is multiply 12 and 6 and 1/9 :) lets set this up
    1                                                                 1         12
6 ----  x  12    or lets set this up like this  6 ----  x  -----
    9                                                                9         1

but lets change that whole fraction into an improper fraction 
    1
6 ----  so all we do is multiply 6 x 9 and add the 1 so lets try that 
    9
 6 x 9 = 54 
54 +1 = 55 
hey look we have our numerator!! ( the top number) 
and our bottom number would stay the same as 9 so lets try this again:)
 55
----- now lets plug it in to our problem 
  9

 55        12
-----   x  -----
  9          1

now lets just multiply across

 55        12    = 55 x 12 = 660
-----   x  ----- 
<span>  9          1     = 9 x 1 = 9 
</span>
so now our fraction look like this 
 660
-------
   9
but lets make it not look so confusing and divide 660 by 9
660/9 = 73.33333333
again it still looks confusing but we can round it out to beeeee
73
so this means that for 12 days Mrs. Fernandez drove 73 miles!
hope this isnt confusing;)
have a good one and mark me brainliest!

3 0
4 years ago
Robert is putting new roofing shingles on his house. Each shingle is 1 2/3 feet long. The north part of the house has a roof lin
Mariana [72]

Answer: 36 shingles can be placed on the north part of the house.

Step-by-step explanation:

Given: Length of each shingle = 1\dfrac23 feet = \dfrac53 feet.

The north part of the house has a roof line that is 60 feet across.

Then, the number of  shingles can be placed  on the north part of the house = (Length of roof line in north part) ÷ (Length of each shingle)

=60\div \dfrac{5}{3}\\\\=60\times\dfrac{3}{5}\\\\=12\times3=36

Hence, 36 shingles can be placed on the north part of the house.

3 0
3 years ago
The 49 can be classfied as which of the following?
oee [108]

Answer:

b

Step-by-step explanation:

49 is a whole number

because it doesn't have a decimal neither is it a fraction

3 0
3 years ago
Read 2 more answers
A group of college DJs surveyed students to find out what music to plan for their upcoming parties. Thirty percent of the studen
Aneli [31]

Answer:

Thus, option “c” 10% is correct.

Step-by-step explanation:

The percentage of students that like dubstep = 30%

The percentage of students that like trance music = 25%

The percentage of student that wants only house music = 20%

The percentage of students that like bot dubstep and trance = 15%

Now we have to find the percentage of students that like trance music but nor dubstep.

The percentage of students that like the trance music but nor dubstep = 100% - 30% – 25 % - 20% - 15%

The percentage of students that like trance music but nor dubstep = 10%

Thus, option “c” 10% is correct.

6 0
3 years ago
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