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3 years ago

Why is the following statement a poor definition? elephants are gigantic animals.

2 answers:

7 0

This is a poor definition because it is not descriptive. If you would have said, "Elephants are an animal that have gigantic feet and gigantic bodies. Elephants also have a trunk that they use to drink water. Along with the trunk elephants also have a mouth." Yes elephant are a gigantic animal, but you have to have reasoning something to back it up or just make it more unique.

notsponge [240]3 years ago

6 0

It is not descriptive

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Solve abc given that C=32 b=8 a=3

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The answer to (a)(b)(c) is 2,656

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4 years ago

While diving, Winston stopped at a point located halfway between his deepest dive and the ocean's surface. At what

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3 years ago

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3 years ago

A recent national survey found that high school students watched an average (mean) of 7.2 movies per month with a population sta

VladimirAG [237]

Answer:

1. Option A

2. Option D) Reject null hypothesis if z < –1.645

3. z = -4.90

4. P-value = 0.00001

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 7.2

Sample mean, $\bar{x}$ = 6.5

Sample size, n = 49

Alpha, α = 0.05

Population standard deviation, σ = 1.0

a) First, we design the null and the alternate hypothesis

$H_{0}: \mu \geq 7.2\text{ movies per month}\\H_A: \mu < 7.2\text{ movies per month}$

Option A) is the correct answer

We use one-tailed(left) z test to perform this hypothesis.

c) Formula:

$z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} }$

Putting all the values, we have

$z_{stat} = \displaystyle\frac{6.5 - 7.2}{\frac{1}{\sqrt{49}} } = -4.90$

b) Now, $z_{critical} \text{ at 0.05 level of significance } = -1.645$

Rejection rule:

If calculated z-statistic is less than the critical z-value, we reject the null hypothesis.

Option D) Reject null hypothesis if z < –1.645

d) Now, we calculate the p-value with the help of standard normal table.

P-value = 0.00001

Since the p-value is lower than the significance level, we fail to accept the null hypothesis and reject it.We accept the alternate hypothesis.

We conclude that the college students watch fewer movies a month than high school students.

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3 years ago

True or false: geometry is an axiomatic system where the accepted principles are undefined terms 0 and 1.

Andrei [34K]

Answer:

C. The statement is false. Geometry is an axiomatic system where the accepted principles are the undefined terms point, line and plane.

Step-by-step explanation:

The 4 basic characteristics of axiomatic systems are:

Undefined terms (or primitive terms)
Axioms (or postulates)
Theorems
Laws of logic

The undefined terms or primitive terms of geometry are points, lines and planes that at some point meet or join together. This is called incidence, since geometry studies their relationship. E.g. 3 lines that form a triangle on a plane.

4 0

3 years ago