reason people give for drinking coffee is “alertness” or “energy”. This could be the case for kids who drink coffee. Or they could be groggier from a lack of sleep due to coffee. We asked n1=50 17-year-old kids who drink coffee if they “felt alert” x1=30 answered yes, we then asked n2=50 kids who don’t drink coffee and x2=20 of the kids answered that they the “felt alert”. We would like to compare these two proportions.
a. What are the estimated proportions?
b. What are the null and alternative hypothesis?
c. Perform the test, what do you conclude?
Another way we could look at this would be to do a test of association on the 2x2 table constructed from this data (see Chapters 17 Section 3 pages 573-579:).
d. Please construct the table
e. What is the new null and alternative hypothesis?
f. What are the expected counts (under the null hypothesis)
g. What are the observed minus expected counts?
h. What is the test statistic? How many degree of freedom?
i. What is the critical value? What do you conclude?
![M = 8<br>s = 6.65<br>М - 13<br>s = 6.65<br>0 1 2 3 4 5 6<br>7 8 9 10 11 12 13 14 15 16 17 18 19 20 21<br>d. Write a table with observations for these samples.<br>e. Using the table, explain (calculate) where the S=6.65<br>comes from<br>f. Conduct a two-tailed comparison of the two groups<br>with a=.05.<br>g. What changed between [a-c] and [d-f]? what<br>impact did it have?<br>5. A reason people give for drinking coffee is](https://s3.us-east-1.amazonaws.com/storage.unifolks.com/qimg-008/008_jln6v50-gzh2thri.png)
Extracted text: M = 8 s = 6.65 М - 13 s = 6.65 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 d. Write a table with observations for these samples. e. Using the table, explain (calculate) where the S=6.65 comes from f. Conduct a two-tailed comparison of the two groups with a=.05. g. What changed between [a-c] and [d-f]? what impact did it have? 5. A reason people give for drinking coffee is "alertness" or "energy". This could be the case for kids who drink coffee. Or they could be groggier from a lack of sleep due to coffee. We asked n;=50 17-year-old kids who drink coffee if they "felt alert" x,=30 answered yes, we then asked n,=50 kids who don't drink coffee and x,=20 of the kids answered that they the "felt alert". We would like to compare these two proportions. a. What are the estimated proportions? b. What are the null and alternative hypothesis? c. Perform the test, what do you conclude? Another way we could look at this would be to do a test of association on the 2x2 table constructed from this data (see Chapters 17 Section 3 pages 573-579:). d. Please construct the table e. What is the new null and alternative hypothesis? f. What are the expected counts (under the null һуpothesis) g. What are the observed minus expected counts? h. What is the test statistic? How many degree of freedom? i. What is the critical value? What do you conclude? 6. We all enjoyed reading "Symptoms of Anxiety or Depressive Disorder and Use of Mental Health Care Among Adults During the COVID-19 Pandemic" (can be found in "Covid Research Papers") a. Please identify the population and sample for study. b. What was the objective of the study? c. How did the researchers go about establishing their sample?