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Allisa [31]
3 years ago
14

A biologist wants to test whether chemically modifying a particular plant family will reduce their ability to retain water and m

oisture. In order to test this, a fixed volume of water is given to plants that have been chemically modified, and plants in a control group that have not been modified. The volume of moisture retained by each plant some time after is then recorded.
The statistics are given in the table below:

Volume of moisture retained
Group Sample Size Sample Mean (ml) Sample Standard Deviation (ml)
Control Group 24 146 114
Modified Group 23 106 115
At level of alpha = 0.05, the null hypothesis that chemical modification does not reduce the plant's ability to retain water and moisture is ________.
Mathematics
1 answer:
Alla [95]3 years ago
8 0

Answer:

the answer is 4.56

Step-by-step explanation:

because it is i use my mommy calculator

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Answer:

3.93% probability that both say service is poor

Step-by-step explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

The customers are chosen without replacement, and the order in which they are chosen is not important. So we use the combinations formula to solve this question.

Combinations formula:

C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

What is the probability that both say service is poor?

Desired outcomes:

Two saying it is poor, from a set of 66. So

D = C_{66,2} = \frac{66!}{2!(66-2)!} = 2145

Total outcomes:

Two customers from a set of 331. So

T = C_{331,2} = \frac{331!}{2!(331-2)!} = 54615

Probability:

p = \frac{D}{T} = \frac{2145}{54615} = 0.0393

3.93% probability that both say service is poor

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2 years ago
Whats complex number ​
Alex

Answer:

Complex numbers are numbers that consist of two parts — a real number and an imaginary number.

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For the function f(x)=|x−7|−4, evaluate f(x+1).
GarryVolchara [31]

Answer:

\displaystyle{f(x+1)=|x-6|-4}

Step-by-step explanation:

To evaluate \displaystyle{f(x+1)}, substitute \displaystyle{x} to \displaystyle{x+1} so we should have:

\displaystyle{f(x+1) = |x+1-7|-4}

Evaluate the expression and finally, we have:

\displaystyle{f(x+1)=|x-6|-4}

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