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3 years ago

15

After deciding what the variables of an experiment are, a scientist should write out a __________, which is a step-by-step list

of directions for performng the experiment, including the instruments to be used and how to use them.
A) procedure
B) hypothesis
C) conclusion

1 answer:

valina [46]3 years ago

7 0

Answer: A Procedure because he needs to know what steps he needs to performing his experiment.

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Consider a set of cards that has four cards labeled 1, 2, 3, and 4. Suppose you pick two cards, without replacement, to obtain t

Phantasy [73]

Answer:

$\begin{array}{cccccc}{Mean} & {1.5} & {2} & {2.5} & {3} & {3.5}\ \\ {Probability} & {\frac{1}{6}} & {\frac{1}{6}} & {\frac{1}{3}} & {\frac{1}{6}} & {\frac{1}{6}}\ \end{array}$

Explanation:

Given

$Cards = \{1,2,3,4\}$

Required

The sampling distribution

The possible selection of 2 cards without replacement is as follows:

$S = \{(1,2) (1,3) (1,4) (2,1) (2,3) (2,4) (3,1) (3,2) (3,4) (4,1) (4,2) (4,3)\}$

Calculate the mean

$\begin{array}{cccccccccccc}{Selection} & {(1,2)} & {(1,3)} & {(1,4)} & {(2,1)} & {(2,3)} & {(2,4)}& {(3,1)} & {(3,2)} & {(3,4)} & {(4,1)} & {(4,2)} & {(4,3)} \ \\ {Mean} & {1.5} & {2} & {2.5} & {1.5} & {2.5} & {3} & {2} & {2.5} & {3.5} & {2.5} & {3} & {3.5}\ \end{array}$

List out the mean and the respective frequency

$1.5 \to 2$

$2 \to 2$

$2.5 \to 4$

$3 \to 2$

$3.5\to 2$

$Total \to 12$

Calculate the probability of each mean

$P(1.5) \to \frac{2}{12} \to \frac{1}{6}\\$

$P(2) \to \frac{2}{12} \to \frac{1}{6}\\$

$P(2.5) \to \frac{4}{12} \to \frac{1}{3}\\$

$P(3) \to \frac{2}{12} \to \frac{1}{6}\\$

$P(3.5) \to \frac{2}{12} \to \frac{1}{6}$

So, the table of sampling distribution is:

$\begin{array}{cccccc}{Mean} & {1.5} & {2} & {2.5} & {3} & {3.5}\ \\ {Probability} & {\frac{1}{6}} & {\frac{1}{6}} & {\frac{1}{3}} & {\frac{1}{6}} & {\frac{1}{6}}\ \end{array}$

3 0

3 years ago

If 5p-7q=70, what is the value of p/7-q/5?<br><br> A. 1/35<br> B. 1<br> C. 2<br> D. 35

wel

Answer:

$5p - 7q = 70 \\ \frac{1}{35} (5p - 7q) = \frac{70}{35} = 2 \\ \frac{p}{7} - \frac{q}{5} = 2$

3 0

2 years ago

Read 2 more answers

If x is between a and b, what would the inequality look like

marissa [1.9K]

Answer:

a<x<b

Explanation:

A is less than X, which is less than b. Could also be a>x>b

4 0

3 years ago

what is the molarity of a solution prepared by dissolving 54.3 g of ca(no3)2 to form 355 ml of the solution?

Ratling [72]

Answer:

The molarity of a solution prepared by dissolving 54.3 g of Calcium nitrate into 355 mL of water is 0.9881M

Molarity of solution is the ratio of the number of moles of the substance to the volume.

n is the number of moles of the compound

Mass of calcium nitrate = 54.3g

Molar mass of calcium nitrate = Ca(NO₃)₂ = 164.088 g/mol

Get the required molarity;

Hence the molarity of a solution prepared by dissolving 54.3 g of Calcium nitrate into 355 mL of water is 0.9881M

Explanation:

:)

6 0

3 years ago

Explain Christian attitudes to the treatment of criminals

amm1812

Well, you cannot base your answer off of what (EVERY) Christian would think, but some of them are forgiving, just as the bible says to do, and they would try to help them. As to where some Christians who do not follow the laws of the bible, they judge and do not forgive. But all in all, criminals do not have the best rep, and most of the time deserve where they are supposed to be. So, most Christians would stay away, but pray for them.

6 0

3 years ago

Read 2 more answers