Reference no: EM13278246
A study is conducted to determine if time of day has any effect on test grades. An introductory psychology class is selected for the study, because it has a standard curriculum taught across many sections. Two classes are selected for each time period: 8:00 AM, 1:00 PM, and 5:30 PM. Out of the total pool of around 40 students for each time period, 15 students are selected at random, for a total of 45. The test is administered to all students, and the test results for the study subjects are placed in SPSS. We want to know if there is a statistical difference between these time periods. What test is appropriate?
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2. Hicks law predicts how long it will take a user to pick out a given element on a website page from among all the other elements on that page. Because a certain website will be used many thousands of times per year on an intranet, a major company engages a usability specialist to test whether the Hicks prediction holds on two proposed home page designs. Because the company is reluctant to have too many employees absent from work stations, it specifies that the test can involve only five individuals, and that therefore the same five people must test both proposed interfaces. We will want to know if there is a significant difference in the times for each interface. What is the appropriate test?
3. Laparoscopic surgery is a procedure for threading a small flexible tube within a patient’s body to explore or perform procedures. A recent study was conducted to see what skills a medical student new to laparoscopic surgery might have that would predict shorter learning times. One variable that was gathered was the amount of time a student had spent playing video games before starting his laparoscopic training. The researcher wants to see if the time spent gaming can predict the time needed to perfect laparoscopic skills. What would be the correct test to apply?
4. A large company is concerned about turnover, so it commissions a survey that will be given to a random group of 1000 employees. The company then wants to get a general idea of what the results would be in the larger population, but while it will look at significance indicators, it is not heavily interested in significance, but in an estimate of company-wide results. What test would be proper to run here?
6. Is the r from question 5 significant? ______________________________________________________________________(5 pts) Refer to the table below. It gives two sets of figures, a predicted rainfall amount from a radar image, and an actual rainfall amount as measured by a standard rain gauge. (X) Radar Rain Prediction (Y) Rain Gauge 3.6 .0 2.0 1.2 1.1 1.2 1.3 1.3 1.8 1.4 2.1 1.4 3.2 2.0 2.7 2.1 2.5 2.5 3.5 2.9 3.9 4.0 3.5 4.9 6.5 6.2 7.3 6.6 6.4 7.8
7. Using the data above and the formulas next to the table, calculate r for the dataset using the method of least squares. (You may use another set of formulas if you like, but these are relatively simple.) Show your work. Use the back of the sheets if necessary.
8. Interpret the r value of problem 7. Be thorough. ____________________________________________________________________
9. State the r2 value of problem 7 and interpret. Be thorough in your interpretation
10. What is the Y intercept for the data from problem 7? 11. What is the confidence interval of problem 7 for X=3.5 with alpha of .05? ___________________________________________________________
12. What is the prediction interval of problem 7 for X=3.5 with alpha of .05?
Attachment:- 576994_1_32000-Test-3.pdf
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We want to know if there is a statistical difference between
: A study is conducted to determine if time of day has any effect on test grades. An introductory psychology class is selected for the study, because it has a standard curriculum taught across many sections. Two classes are selected for each time perio..
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