Mathematics, 11.02.2020 04:46 libertycooper

A study to compare two methods of preserving wood started with boards of southern white pine. Each board was ripped from end to end to form two edge-matched specimens. One was assigned to Method A, the other to Method B.
1. What is the name for each of these study designs?
A) A block design. B) A matched pairs design. C) A probability sampling design. D) A stratified random sample design.

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Answer from: britishgirl1

B) A matched pairs design.

Because we satisfy the condition of randomized block design. We just have two treatment conditions (Method A and B) and the information can be grouped by pairs and the researcher define a blocking variable. And all the subjects are randomly assigned to the treatments.

Step-by-step explanation:

For this case we want to compare two methods preserving wood started with boards of southern white pine.

Let's analyze one by one the possible options for this case:

A) A block design.

False. In order to satisfy a block design we need to satisfy a placebo condition at some level, and that's not the case.

B) A matched pairs design.

C) A probability sampling design.

False. That's a a method for select the sample but is not appropiate used when we want to select a design

D) A stratified random sample design.

False. That's a a method for select the sample but is not appropiate used when we want to select a design

Answer from: Quest

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring). so find the distance between (1,2) and (4,2). that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3. it is a regular polygon which means all sides are congruent. you have 6 sides (hexa) so multiply 6 by 3 to receive 18.

Answer from: Quest

Hello!

the answer is:

the correct option:

b. $x=2.23$

why?

to solve the problem, we need to remember how to operate to simplify exponential expressions using the logarithms.

we are given the equation:

$7^{x}=77$

then, using placing logarith with base 7 on both sides of the equation, we have:

$7^{x}=77log_{7}(7^{x})=log_{7}(77)x=log_{7}(77)x=2.2322$

so, rounding the obtained result to two decimal places (nearest hundreth), we have:

$x=2.23$

hence, we have that the correct option:

b. $x=2.23$

have a nice day!

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A study to compare two methods of preserving wood started with boards of southern white pine. Each b...