Hypothesis Testing - personal.kent.edu
... The magnitude of s (or s2) – since we’re dividing by s, smaller values of s result in larger values of t or z [i.e. we want to decrease variability in our sample (error)] The sample size – the bigger the bigger t and z The significance level (α) – the smaller the α, the higher the critical t to reje ...
... The magnitude of s (or s2) – since we’re dividing by s, smaller values of s result in larger values of t or z [i.e. we want to decrease variability in our sample (error)] The sample size – the bigger the bigger t and z The significance level (α) – the smaller the α, the higher the critical t to reje ...
Inference about Mean (σ Unknown)
... categorical variables. Consider the variable, Supports Obama. The variable has two categories, yes and no. We will consider the yes category as a “success” and the no category a “failure”. Suppose we have a population of 1000 voters, and 550 support Obama. We define proportion of success for the pop ...
... categorical variables. Consider the variable, Supports Obama. The variable has two categories, yes and no. We will consider the yes category as a “success” and the no category a “failure”. Suppose we have a population of 1000 voters, and 550 support Obama. We define proportion of success for the pop ...
Practice Midterm 2
... 2 two-sided sheets of notes. There are 8 problems, with point values as shown. If you want to receive partial credit for wrong answers, show your work. Don’t spend too much time on any one problem. 1. (30 pts.) The proportion of high school seniors who are married is 0.02. Suppose we take a random s ...
... 2 two-sided sheets of notes. There are 8 problems, with point values as shown. If you want to receive partial credit for wrong answers, show your work. Don’t spend too much time on any one problem. 1. (30 pts.) The proportion of high school seniors who are married is 0.02. Suppose we take a random s ...
Quizch21_key
... Suppose a 95% confidence interval for the difference in test scores between Class 1 and Class 2 (in that order) is the following: 9 +/− 2. These results were based on independent samples of size 100 from each class. 18. {Classes 1 and 2 narrative} What can you conclude? a. You are confident that the ...
... Suppose a 95% confidence interval for the difference in test scores between Class 1 and Class 2 (in that order) is the following: 9 +/− 2. These results were based on independent samples of size 100 from each class. 18. {Classes 1 and 2 narrative} What can you conclude? a. You are confident that the ...
The Standard Error of the Slope
... a mean, y , and a measure of variability, . The mean of each conditional distribution lies on the theoretical line and the variability is assumed to be the same for each value of x. This implies that measures the variability of all values of y about the true regression line. This fact is used ...
... a mean, y , and a measure of variability, . The mean of each conditional distribution lies on the theoretical line and the variability is assumed to be the same for each value of x. This implies that measures the variability of all values of y about the true regression line. This fact is used ...
AP Statistics Assignment - Tenth Chapter (In Class work is in
... A news article on a Gallup Poll noted that “28 percent of the 1548 adults questioned felt that those who were able to work should be taken off welfare.” The article also said, “The margin of error for a sample size of 1548 is plus or minus three percentage points.” 1. Opinion polls usually announce ...
... A news article on a Gallup Poll noted that “28 percent of the 1548 adults questioned felt that those who were able to work should be taken off welfare.” The article also said, “The margin of error for a sample size of 1548 is plus or minus three percentage points.” 1. Opinion polls usually announce ...
DOC - JMap
... - It would not make sense to say that the vendor sold -3 sandwiches or to use any other negative numbers. - It would not make sense to say the vendor sold , sandwiches, e sandwiches, or sandwiches. - It would make sense to say that the vendor sold 0, 1, 2, or any whole number of sandwiches. Thus, th ...
... - It would not make sense to say that the vendor sold -3 sandwiches or to use any other negative numbers. - It would not make sense to say the vendor sold , sandwiches, e sandwiches, or sandwiches. - It would make sense to say that the vendor sold 0, 1, 2, or any whole number of sandwiches. Thus, th ...
estimating with confidence
... a sample survey, can cause additional errors that may be larger than the random sampling error. Not in great danger if data can plausibly be thought of as observations taken at random from a population. The formula is not correct if the was collected with sampling designs more complex than an SRS. M ...
... a sample survey, can cause additional errors that may be larger than the random sampling error. Not in great danger if data can plausibly be thought of as observations taken at random from a population. The formula is not correct if the was collected with sampling designs more complex than an SRS. M ...
German tank problem
In the statistical theory of estimation, the problem of estimating the maximum of a discrete uniform distribution from sampling without replacement is known in English as the German tank problem, due to its application in World War II to the estimation of the number of German tanks.The analyses illustrate the difference between frequentist inference and Bayesian inference.Estimating the population maximum based on a single sample yields divergent results, while the estimation based on multiple samples is an instructive practical estimation question whose answer is simple but not obvious.