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renee9913
01.04.2020 •
Mathematics
In a recent year, 73% of first-year college students responding to a national survey identified "being very well-off financially" as an important personal goal. A state university finds that 132 of an SRS of 200 of its first-year students say that this goal is important. Is there convincing evidence at the α=0.05 significance level that the proportion of all first-year students at this university who think being very well-off is important differs from the national value, 73%?
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Ответ:
So the p value obtained was a very low value and using the significance level given
we have
so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the proportion of first-year students say that this goal is important is different from 0.73 at 5% of significance
Step-by-step explanation:
Data given and notation
n=200 represent the random sample taken
X=132 represent the number of first-year students say that this goal is important
Confidence=95% or 0.95
z would represent the statistic (variable of interest)
Concepts and formulas to use
We need to conduct a hypothesis in order to test the claim that the true proportion differes from 0.73.:
Null hypothesis:
Alternative hypothesis:
When we conduct a proportion test we need to use the z statistic, and the is given by:
The One-Sample Proportion Test is used to assess whether a population proportion
is significantly different from a hypothesized value
.
Calculate the statistic
Since we have all the info requires we can replace in formula (1) like this:
Statistical decision
It's important to refresh the p value method or p value approach . "This method is about determining "likely" or "unlikely" by determining the probability assuming the null hypothesis were true of observing a more extreme test statistic in the direction of the alternative hypothesis than the one observed". Or in other words is just a method to have an statistical decision to fail to reject or reject the null hypothesis.
The significance level provided
. The next step would be calculate the p value for this test.
Since is a bilateral test the p value would be:
So the p value obtained was a very low value and using the significance level given
we have
so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the proportion of first-year students say that this goal is important is different from 0.73 at 5% of significance
Ответ:
a =![\frac{13}{5}](/tpl/images/1403/6836/15de5.png)
Step-by-step explanation:
Given
a =
, substitute y = 4 , x = 6
a =
=
=
= ![\frac{13}{5}](/tpl/images/1403/6836/15de5.png)