A classroom has 12 girls for every 4 boys. What is the ratio of boys to total students?
2 answers:
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Answer:
1) Random: A random sample needs to be obtained in order to apply inference for the mean
2) Normality condition: The sampling distribution of needs to be approximately normal. If we use a random sample size higher than 30 we can use the Central Limit theorem to verify this condition.
3) Independence: All the individual observations need to be independent. And we need to satisfy that our sample would be lower than 10% of the real population size.
Step-by-step explanation:
For this case we need three conditions:
1) Random: A random sample needs to be obtained in order to apply inference for the mean
2) Normality condition: The sampling distribution of needs to be approximately normal. If we use a random sample size higher than 30 we can use the Central Limit theorem to verify this condition.
3) Independence: All the individual observations need to be independent. And we need to satisfy that our sample would be lower than 10% of the real population size.
Data given and notation
represent the sample mean
represent the sample standard deviation
sample size
represent the value that we want to test
represent the significance level for the hypothesis test.
t would represent the statistic (variable of interest)
represent the p value for the test (variable of interest)
State the null and alternative hypotheses.
We can assume the following system of hypothesis.
Null hypothesis:
Alternative hypothesis :
The degrees of freedom on this case:
Compute the test statistic
The statistic for this case is given by:
(1)
t-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".