Guess That Test
A random sample of 150 apples found that 88 of the apples are green, while a random sample of 250 bananas found that 130 were green. Do these results show that there is a difference between apples and bananas being green?
2 Proportion Z Test
What are the conditions that need to be checked in a Z Test?
Random
10% Condition
Success/Failure
What is the difference between a Z test and a T test?
T tests are used when the problem is about averages. Variables are quantitative.
How do you pronounce "Chi"?
Kai
A poll conducted at CHS classified students by their gender and political party. Is there an association between gender and political party?
Chi-Squared Test for Independence
What is the difference between a Type I and Type 2 error?
Type 1- Reject the null hypothesis when you shouldn't have
Type 2- Fail to reject the null hypothesis when you shouldn't have
What are the conditions of a two sample t-test?
Random
10% Rule
Nearly Normal
Ind. Groups
Which Chi-Square test do you use when you have one sample and multiple variables?
Chi-Squared Test for Independence
Do dogs run more than cats? A random sampling of 269 dogs found that dogs ran an average of 20.2 miles per week with a standard deviation of 8.1. A random sampling 170 cats found that the average cat runs 19 miles per week with a standard deviation of 4.2.
2 Sample T Interval
What does the p-value mean in context?
Probability of observing a value at least as unique as the proportion we observe
DAILY DOUBLE
Apple sellers are curious about the price apple buyers are willing to pay for apples. They sample 40 apple buyers to see the top price they are willing to pay. The sample showed the average price was $60, and the standard deviation was $15.
Assuming all conditions are met, construct a 95% confidence interval for the mean price of apples today.
(55.157, 64.843)
I am 95% confident the price of apples is between $55.16 and $64.84
21 11 24
28 15 31
17 23 14
Find the expected count from the data table above
20.09 14.91 21
26.54 19.71 27.75
19.37 14.38 20.25
Mike, Tyler, Tabor and three others did poorly on their AP Stats exam, and have to repeat the course in the summer. They get to retake the exam after the summer.
May- 50, 55, 49, 36, 51, 48
August- 51, 55, 60, 75, 88
If these students are representative of all students who take the summer class, do these results provide evidence the class is worthwhile?
Paired T Test
Ho: p=.19
Ha: p<.19
p hat=.19
q hat=.81
n=72
Assuming all conditions are met, and the alpha level is .05, find the p-value and whether the null hypothesis should be rejected or not.
p-value=.0793
Fail to reject the null hypothesis
What is the t score formula?
t= x bar - M/SD
The formula for calculating a Chi-Square Test Statistic is ____
The sum of [(observed-expected)^2]/(expected)