Which histogram(s) should we check for the Nearly Normal condition?
Question 5
5.
How do we check the Independence Assumption? (check all that apply)
Question 6
6.
Before you took this course, you may have heard stories about how difficult Statistics can be. Oftentimes, parents have had bad experiences with Stats courses and pass on their anxieties to their kids. To test whether actually taking AP Stats actually decreases students' anxieties about Stats, an instructor gave a test to rate student anxiety at the beginning of the course and at the end of the course. Anxiety levels were measured on a scale of 1-10. Here are the data for 16 randomly chosen students from a class of 180 students.
Does this provide evidence that anxiety levels about Statistics decrease after students take AP Statistics? (You'll need the df, t-statistic, and p-value for the next few answers, so I would write them down)
How many degrees of freedom does this test have?
Question 7
7.
What is the value of the t-statistic? (round to three decimals)
Question 8
8.
What is the p-value? (round to five decimals)
Question 9
9.
Question 10
10.
Before you took this course, you may have heard stories about how difficult Statistics can be. Oftentimes, parents have had bad experiences with Stats courses and pass on their anxieties to their kids. To test whether actually taking AP Stats actually decreases students' anxieties about Stats, an instructor gave a test to rate student anxiety at the beginning of the course and at the end of the course. Anxiety levels were measured on a scale of 1-10. Here are the data for 16 randomly chosen students from a class of 180 students.
Create a 90% confidence interval to estimate the mean decrease in anxiety about Statistics. Use format (.888,.999) no spaces, with parentheses, three decimal places.
Question 11
11.
Write your conclusion.
Question 12
12.
To be sure your hypothesis test is consistent with your confidence level of 90%, what alpha level should you use?
Question 13
13.
For which of the following scenarios should you use a matched pairs design and test?
A company is testing a migraine treatment. They want to compare subjects pain level before taking the medication and after.
A company wants to know if a scheduled exercise break may improve job satisfaction.
An advertising agency wants to know whether a potential ad campaign appeals more to men or women.
A political party wants to know whether a moderate candidate has more appeal in California or Florida.
A school district wants to know whether a new reading program is effective in improving reading levels for students who are two or more grade levels behind.
Before you took this course, you may have heard stories about how difficult Statistics can be. Oftentimes, parents have had bad experiences with Stats courses and pass on their anxieties to their kids. To test whether actually taking AP Stats actually decreases students' anxieties about Stats, an instructor gave a test to rate student anxiety at the beginning of the course and at the end of the course. Anxiety levels were measured on a scale of 1-10. Here are the data for 16 randomly chosen students from a class of 180 students.
What type of hypothesis test will you complete?
2-prop z-test
1-sample t-test
2-sample t-test
Matched pairs t-test
None of these
Before you took this course, you may have heard stories about how difficult Statistics can be. Oftentimes, parents have had bad experiences with Stats courses and pass on their anxieties to their kids. To test whether actually taking AP Stats actually decreases students' anxieties about Stats, an instructor gave a test to rate student anxiety at the beginning of the course and at the end of the course. Anxiety levels were measured on a scale of 1-10. Here are the data for 16 randomly chosen students from a class of 180 students.
What type of hypotheses will you test?
None of these.
Post-Pre Differences
All three histograms
You don't need to check the histograms because both samples are large enough
You don't need to check the histograms because the number of pairs is large enough
Which two parts should make up your conclusion?
Based on the low p-value, I reject the null.
Based on the low p-value, I fail to reject the null.
Based on the high p-value, I reject the null.
Based on the high p-value, I fail to reject the null.
There is evidence that taking an AP Statistics course may reduce anxiety about Statistics.
There is not evidence that taking an AP Statistics course may reduce anxiety about Statistics.
Perhaps it is true taking the AP Statistics course doesn't really decrease anxiety about statistics. Was an error made? If so, what kind? (check all that apply)