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3 years ago

Please Help me With this

Mathematics

1 answer:

timofeeve [1]3 years ago

4 0

Answer:

answer : A

Step-by-step explanation:

hello :

Sin 42°= Cos(90°-42°)=cos(48°)......answer : A

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How do I factor 1/4d-3/4

kvasek [131]

1/4d - 3/4 =
1/4(d - 3)

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3 years ago

Being timed please help

Dafna1 [17]

Number 4 is arithmetic explicit

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2 years ago

Students make 76.5 ounces of liquid soap for a craft fair they put the soap in 4.5 ounces bottles and sell each bottle for 5.59

liberstina [14]

Answer:

95.03

Step-by-step explanation: Divide 76.5 by 4.5

Now you have 17

Now, multiply 17 by 5.59.

Good job, these students are now successful coronavirus fighters.

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3 years ago

A phycologist is interested in determining the proportion of algae samples from a local rivulet that belong to a particular phyl

LuckyWell [14K]

Answer:

A sample of 16577 is required.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the z-score that has a p-value of $1 - \frac{\alpha}{2}$ .

The margin of error is of:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a p-value of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

She wants to estimate the proportion using a 99% confidence interval with a margin of error of at most 0.01. How large a sample size would be required?

We have no estimation for the proportion, and thus we use $\pi = 0.5$ , which is when the largest sample size will be needed.