What is the z-score of sample X, if $$

Alexandra Richardson
2022-07-16
Answered

What is the z-score of sample X, if $$

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asked 2022-07-23

The probability distributions for 2 variables are defined as followsX ~ N$(120,{\sigma}^{2})$ and Y ~ N$(\mu ,2{\sigma}^{2})$ and $P(X<124)$ = $P(Y>124$. Calculate $\mu $.

asked 2022-05-13

I'm new here and was hoping you guys could help me with a statistics problem that I don't quite understand. I'm not sure if it's proper etiquette to ask for help on a specific homework problem here, so I apologize if this question is out of line.

Here is the problem:

Suppose a variable of a population has mean 5 and standard deviation 11. For samples of size 121, find $c$ so that $P(X>2c)=0.3300$.

Here is the problem:

Suppose a variable of a population has mean 5 and standard deviation 11. For samples of size 121, find $c$ so that $P(X>2c)=0.3300$.

asked 2022-08-15

What is the z-score of sample X, if $n=169,\mu =41,St.Dev.=39,\phantom{\rule{1ex}{0ex}}\text{and}\phantom{\rule{1ex}{0ex}}E\left[X\right]=43$?

asked 2022-08-22

What is the z-score of sample X, if $n=256,\text{}\mu =88,\text{}\text{St.Dev}=128,\text{}{\mu}_{X}=104$?

asked 2022-05-15

$X\sim N(15,4)$

Find P( X > 18.7 | X > 11.7 ).

Attempt: Rewrite as P ( x > 18.7) - P( x > 11.7)

Using the phi function

$\varphi (1.85)-\varphi (-1.65)=(0.9678)-(0.0495)=0.9183$

Where did I go wrong?

Find P( X > 18.7 | X > 11.7 ).

Attempt: Rewrite as P ( x > 18.7) - P( x > 11.7)

Using the phi function

$\varphi (1.85)-\varphi (-1.65)=(0.9678)-(0.0495)=0.9183$

Where did I go wrong?

asked 2022-07-23

How do you find the probability of $P(-1.96<z<1.96)$ using the standard normal distribution?

asked 2022-07-16

What is the z-score of sample X, if $n=36,\text{}\mu =5,\text{}\text{St.Dev}=9,\text{}{\mu}_{X}=6$?