Hypothesis testing decisions
You end up with a p value of .00024, what decision should you make?
Reject the null (H0)
Moderately strong, negative, linear relationship
You feel you have a 60% chance of getting each individual multiple choice question correct. What is the probability that your first correct answer will come on exactly the 3rd question? (you must label each calculator input if you use the calculator)
geometpdf(p=.6, x=3)=.096
A certain strongly skewed distribution has a mean of 650 and standard deviation of 45. If you take a sample of size 100, what kind of distribution is the sampling distribution and what are its parameters?
Normal, mean = 650, standard deviation (standard error) = 4.5
Name 2 of the artists on this 2011 song
You are trying to determine if AP students are inherently more talented than non AP students. Your null hypothesis would then be that AP students are equally talented with non AP students. You perform a significance test and make the conclusion that you should not reject the null. It turns out that in reality AP students are more talented so the null was false. What type of error did you make?
Type II Error (failed to reject null when it was actually false)
Write out the words that go with the acronym SOCS and give an example of something you could use to represent each (you do not need to give an example for O)
S -Shape (skewed left or right, bell shaped, symmetric, unimodal or bimodal)
O -Outliers
C -Center (mean, median)
S -Spread (range, IQR, standard deviation)
You feel you have a 60% chance of getting each individual multiple choice question right. What is the probability you would get at most 8 out of 10 questions right? (you must label each calculator input if you use the calculator)
binomcdf(n=10, p=.6, x=8) = .9536
You are curious about what percentage of AP Statistics students at Berks Catholic feel confident about the AP Exam (8th period is the only section of this class). To do this you take a random sample of 23 students in the class and 12 say yes, 11 say no. What condition for inference was violated?
Your sample size is greater than 10% of the population
Name either artist on this 2014 song
Calvin Harris, Ellie Goulding - Outside
Stopping distances of cars are approximately normally distributed with a mean of 125 feet and standard deviation of 6.5. (you must label the calculator commands if you use the calculator)
A) What is the 80th percentile of the distribution of stopping distances?
B) What is the probability a randomly selected car would take longer than 135 feet to stop?
A) InvNorm(area = .8, mean = 125, standard deviation = 6.5) = 130.47
B) normalcdf(lower bound = 135, upper bound = infinity, mean = 125, standard deviation = 6.5) = .062
A survey is being conducted to estimate the education level of adults in the United States. Since education is largely the responsibility of each state, the researcher wants to be sure that estimates are available for each state as well as for the nation. Identify a sampling method that will achieve this additional goal
Stratified random sample (surveying a set number from each state)