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Anna35 [415]
3 years ago
15

A group of inexperienced weightlifters was randomized to either perform Crossfit or Olympic lifting workouts for 10 weeks. We th

en determined whether or not each participant increased their one repetition maximum (1RM) by more or less than 15%. What statistical test should be used to determine if the proportion of participants that increased their 1RM by more than 15% is higher in those performing Crossfit or Olympic lifting?
Physics
1 answer:
lora16 [44]3 years ago
5 0

The appropriate hypothesis test for this question is the two proportions test. As the name implies, it is often used to compare existing percentages between two groups. The raw data behind the percentages must be available as the sample size becomes crucially important in determining the test statistics.

The test statistic of the two-proportion test is the Z value. When the sample becomes very large, the Z value is governed under a normal function and is commonly known as the standardized Z value

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Trace fossils are recognized as evidence of which pre-existing life? plants plants and animals neither plants nor animals animal
photoshop1234 [79]

Answer:

a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.

Explanation:

Trace fossils are the indirect evidence of life in the past, such as the footprints, tracks, burrows, borings, and feces left behind by animals, rather than the preserved remains of the actual animal body itself.

Fossil is the naturally preserved remains of plants and animals which somehow get trapped in amber, hair, petrified wood, oil, coal, and DNA remnants.

5 0
4 years ago
Read 2 more answers
Two velocity vectors, one is twice of the other, and separated by 90 Degree angle. If their resultant is calculated 90 m/s, what
Artyom0805 [142]

Answer:

Vy = 80.5 [m/s]

Explanation:

In order to solve this problem we must use the Pythagorean theorem.

V = 90 [m/s]

The components are Vx and Vy:

Therefore:

v=\sqrt{v_{x}^{2} + v_{y}^{2}   }

where:

Vy = 2*Vx ; because one is twice of the other.

90 = \sqrt{v_{x}^{2}  +(2*v_{x})^{2} }\\ 90 =\sqrt{v_{x}^{2}+4*v_{x}^{2}} \\90 =\sqrt{5v_{x}^{2}} \\90=2.23*v_{x} \\v_{x}=40.25[m/s]

and the bigger vector is:

Vy = 40.25*2

Vy = 80.5 [m/s]

3 0
3 years ago
Metals such as aluminum can be formed into thin sheets because they are
Korvikt [17]

Answer:

They are malleable.

Explanation:

Malleability is the property of metals that causes them to be able to be formed into thin sheets without breaking.

All metals are malleable.

The reason why metals are malleable is because the atoms in the metals have a stable structure and hence, when beaten, the atoms can move freely among each other and maintain their structure.

8 0
3 years ago
Read 2 more answers
Cosmic Microwave Background radiation is one piece of supporting evidence for the Big Band Theory. Are these microwaves at the l
dolphi86 [110]

Answer:

it is long.

Explanation:

I know the answer but I don't know how to explain it

3 0
3 years ago
Problem: The frequency of an FM radio station is 89.3 MHz. Calculate its period. Part B: From the Library, select the general eq
vekshin1

Answer:

Time period, T=1.11\times 10^{-8}\ s

Explanation:

We have,

The frequency of an FM radio station is 89.3 MHz.

It is required to find the period of the wave.

The reciprocal of frequency is called time period of a wave. It can be given by :

T=\dfrac{1}{f}\\\\T=\dfrac{1}{89.3\times 10^{6}\ Hz}\\\\T=1.11\times 10^{-8}\ s

So, the period of the wave is 1.11\times 10^{-8}\ s.

5 0
3 years ago
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