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anastassius [24]
2 years ago
8

Charlie wants to estimate how much time in the eighth grade students in his school spend on their homework each night which samp

le of matter would give Charlie the best estimate
Mathematics
1 answer:
Fudgin [204]2 years ago
7 0

Answer:

it is b

Step-by-step explanation:

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Bill rented a truck for one day.There was a base fee of $15.95,and there was a additional charge of 92 cents for each mile drive
denpristay [2]

Answer:

271 miles

Step-by-step explanation:

15.95+0.92 x=265.27

0.92 x=265.27-15.95

.92 x=249.32

x=24932/92=271

6 0
3 years ago
Find each missing length, make sure you give both exact AND approximate. Brainliest + 50pts
goldenfox [79]

#1

  • B²=15²-7²
  • B²=225-49
  • B²=176
  • B=13.26(exact)
  • B=13.3(approx)

#2

  • B²=17²-7²
  • B²=289-49
  • B²=240
  • B=15.49(exact)
  • B=15.5

#3

  • H²=20²+14²
  • H²=400+196
  • H²=596
  • H=24.41(approx)
  • H=24.4(exact)

#4

  • B²=6²-3²
  • B²=36-9
  • B²=27
  • B=5.196(exact)
  • B=5.2(approx)
3 0
2 years ago
A study was conducted to determine if the salaries of elementary school teachers from two neighboring districts were equal. A sa
Semenov [28]

Answer:

H₀: μ₁ - μ₂ = 0

H₁: μ₁ - μ₂ ≠ 0

(–2975, 175)

Do not reject H₀

Step-by-step explanation:

Hello!

The objective of this experiment is to test if the salaries of elementary school teachers are equal in two districts. You can test this trough the population means of the salaries of the teachers if they are either equal or different or directly test if the difference between the salaries of the two districts is cero or not, symbolically: μ₁ - μ₂ = 0

Remember, in the null hypothesis is usually stated the known information, is the "no change" premise and always carries the = symbol.

The hypothesis is:

H₀: μ₁ - μ₂ = 0

H₁: μ₁ - μ₂ ≠ 0

You have two normally distributed variables and you are studying the difference of the means. You can use a pooled Z to make the interval, the formula is:

X[bar]₁-X[bar]₂ ± Z_{1-\alpha /2}*(√(σ₁²/n₁+σ₂²/n₂)

Since the test is two-tailed and at a signification level of 5% I've made the interval at the complementary confidence level of 95% so that I can use it to decide over the hypothesis.

X[bar]₁-X[bar]₂ ± Z_{1-\alpha /2}*(√(σ₁²/n₁+σ₂²/n₂)

Z_{1-\alpha /2} = Z_{0,975} = 1,96

[28900-30300 ± 1.96*(√((2300)²/15+(2100)²/15)]

[-1400 ± 1576,15]

[-2976.15;176,15]

Since I've approximated to two decimal units in the intermediate calculations, the values ​​differ slightly, but the interval is:

(–2975, 175)Now, since the 0 is contained in the Confidence interval, the decision is to not reject the null hypothesis. In other words, the difference in average salaries between the two districts is cero.

I hope it helps!

4 0
3 years ago
A shape is made of 9 right triangles of equal size and three identical rectangles. Each rectangle measures 7 mm wide and 3 mm hi
e-lub [12.9K]

Answer:

21

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
What is the volume of this prism? Rectangular prism composed of unit cubes. Prism is 6 units by 9 units by 7 units. units3
adoni [48]
The answer is:  " <span>378 units</span>³ " .
________________________________________________

( 6 units)  * ( 9 units) * (7 units)  = (6 * 9 * 7) units³ =  378 units³ .
________________________________________________
4 0
3 years ago
Read 2 more answers
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