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snow_lady [41]
3 years ago
15

Which number is irrational? A) 16.5% B) 0.0675 Eliminate C) 8 3/4 D) π

Mathematics
1 answer:
iren2701 [21]3 years ago
8 0
I would say A. 16.5 %
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In 1998 the average income for middle class families in the US was $37,100 with a population standard deviation of $6362. We wan
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Answer:

Since we know the population deviation, is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:  

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}} (1)  

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

The best answer would be:

A. Z test

Step-by-step explanation:

Data given and notation  

\bar X=36670 represent the mean average

\sigma=6362 represent the population standard deviation for the sample  

n=1225 sample size  

\mu_o =37100 represent the value that we want to test  

\alpha represent the significance level for the hypothesis test.  

z would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the mean is equal or not to 37100, the system of hypothesis would be:  

Null hypothesis:\mu =37100  

Alternative hypothesis:\mu \neq 37100  

Since we know the population deviation, is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:  

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}} (1)  

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

The best answer would be:

A. Z test

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3 years ago
Tracey has 29 students in her class. She has 21 boys in her class. What is the ratio of girls to boys in her class
Xelga [282]

First find the number of girls in her class.

29 student - 21 boys = 8 girls

So, the ratio of girls to boys is:

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Or just:

8:21

answer: 8:21

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Answer:

5/51 or 0.098

Step-by-step explanation:

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3 years ago
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(2.6x7)/2

18.2/2

Area=9.1 m^2
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Neporo4naja [7]

Answer:

64 hope it helps

Step-by-step explanation:

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