The outside temperature was 8 degrees. A cold front dropped the temperature 11 degrees. What is the new temperature?
1 answer:
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Answer:
Null hypothesis:
Alternative hypothesis:
The conditions and requirements are explained on detail below.
Step-by-step explanation:
1) Data given and notation n
n=384 represent the random sample taken
X=46 represent the children with abnormalities in the sample
estimated proportion of children with abnormalities in the sample
is the value that we want to test
represent the significance level (no given)
z would represent the statistic (variable of interest)
represent the p value (variable of interest)
p= proportion of children with congenital abnormalities
2) Concepts and formulas to use
We need to conduct a hypothesis in order to test the claim that the proportion of children with congenital abnormalities exceeds 5%. :
Null hypothesis:
Alternative hypothesis:
We assume that the proportion follows a normal distribution.
When we conduct a proportion test we need to use the z statistic, and the is given by:
(1)
The One-Sample Proportion Test is used to assess whether a population proportion is significantly (different,higher or less) from a hypothesized value
.
<em>Check for the assumptions that he sample must satisfy in order to apply the test</em>
a)The random sample needs to be representative: On this case the problem no mention about it but we can assume it.
b) The sample needs to be large enough
3) Calculate the statistic
Since we have all the info requires we can replace in formula (1) like this:
4) 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 is not provided usually is . The next step would be calculate the p value for this test.
Since is a one side test the p value would be:
Based on the p value obtained 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 children with abnormalities exceeds 0.05 or 5% .