P-Value
The probability of getting a value as extreme or more extreme than the observed value, assuming the null hypothesis is true
What is p-value?
Condition used to sample without replacement
What is 10% Condition
(Sample is less than 10% of population)
About 50% of students in the USA have a GPA above 3.0. A teacher at Rocky River High believes this is different for her school. She collects a random sample of 50 students (every grade level included) and finds 55% of students have a GPA above 3.0.
The inference test that should be used to make a 90% confidence interval to find the true proportion of students with a GPA above 3.0 at Rocky River.
What is a One Sample Z Interval for proportion
The value compared to the p-value used to reject or fail to reject the null hypothesis
What is alpha/significance level?
Must be used to be able to generalize findings to the population
What is Random Sample
A researcher wants to know if the mean spending of online shoppers is different between men and women. She takes two separate random samples (one for males and one for females) and records the means and standard deviations.
The inference test that should be used
What is a two sample t test for a difference in means
If the p-value is less than the significance level you should
What is Reject Ho and accept Ha
Condition that shows if the sample is equal to or greater than 30, normal calculations can be used
What is Central Limit Theorem
A scientist wants to know whether a new meal plan helps people lose weight. She finds the weight of 32 volunteers before and after following the meal plan.
The test that should be used to find if the meal plan causes people like those in the study to lose weight
A Paired T-test for a mean difference
If the p-value is greater than alpha you should...
What is fail to reject Ho
Large Counts Condition checks...
What is if the number of successes and failures in an observation are greater than 10
A company wants to know if employees would like new uniforms. Corporate took a random sample of 120 workers and found that 70 of them favor new uniforms.
Construct a 95% confidence interval to estimate the true proportion of all workers at the company that want new uniforms and name the inference test used.
What is (0.4951,0.6715) and a one sample z-interval