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Sergeu [11.5K]
3 years ago
7

Which expression(s) are equivalent to: x 3/4

Mathematics
2 answers:
Gennadij [26K]3 years ago
6 0

Answer:

B and D

Step-by-step explanation:

Hi im new here :3

scZoUnD [109]3 years ago
5 0
B and D are equivalent
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The bacterial strain Acinetobacter has been tested for its adhesion properties, which is believed to follow a normal distributio
pantera1 [17]

Answer:

a) Alternative hypothesis should be one sided. Because Null and Alternative hypotheses are:

H_{0}: μ=2.66 dyne-cm.

H_{a}: μ<2.66 dyne-cm.

b) the hypothesis that mean adhesion is at least 2.66 dyne-cm is true

Step-by-step explanation:

Let μ be the mean adhesion in dyne-cm.

a)

Null and alternative hypotheses are:

H_{0}: μ=2.66 dyne-cm.

H_{a}: μ<2.66 dyne-cm.

b)

First we need to calculate test statistic and then the p-value of it.

test statistic of sample mean can be calculated as follows:

t=\frac{X-M}{\frac{s}{\sqrt{N} } } where

  • X  is the sample mean
  • M is the mean adhesion assumed under null hypothesis (2.66 dyne-cm)
  • s is the standard deviation known  (0.7 dyne-cm_2)
  • N is the sample size(5)

Sample mean is the average of 2.69, 5.76, 2.67, 1.62 and 4.12 dyne-cm, that is \frac{2.69+5.76+2.67+1.62+4.12}{5} ≈ 3.37

using the numbers we get

t=\frac{3.37-2.66}{\frac{0.7}{\sqrt{5} } } ≈ 2.27

The p-value is ≈ 0.043. Taking significance level as 0.05, we can conlude that sample proportion is significantly higher than 2.66 dyne-cm.

Thus, according to the sample the hypothesis that mean adhesion is at least 2.66  dyne-cm is true

3 0
3 years ago
Srry if the picture is a little blurry
aniked [119]
ANSWER: C)30yd EXPLAINED: base x hight devided by 2 or 1/2 hope this helps
5 0
3 years ago
What can be added to -1 so it can be a positive 1?
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So represent missing number with x
x means unknown so
x+-1=+1
adding a negative means subtraction
x-1=1
you can do anything to an equation as long as you do it to both sides
add 1 to both sides
x+1-1=1+1
x+0=2
x=2

the number is 2
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If x is 6, then 7x = _____.
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Answer:

7×6

=42

hope this helps you

4 0
2 years ago
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Find the percent of change and describe it as an increase or decrease. If necessary, round to the nearest tenth.
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B 25%percent increase is the answer
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