MUST USE JAMOVI!!! Take home exam #1 psychology stats
Name________________________________________________________
Statistics for Psychology-Take home Exam 1
This exam should be completed on your own. Working together with anyone to complete these questions is cheating and is in violation of Temple University’s Academic Honesty Policy. See page 14 of the syllabus.
If you cheat on this exam you will receive zero points and will be referred to the University Disciplinary Committee for further action.
Some of the following questions will require hand calculations and some will require you to use Jamovi.
Hand calculations
For the questions that will require hand calculations, be sure to show ALL your work.
If no work is shown, even a correct answer will result in zero points.
Jamovi
For the questions that will require Jamovi, you will need to turn in a Jamovi output. Generate only what is best/appropriate. Points will be taken off for unnecessary/inappropriate numbers.
Once you have produced the appropriate output for each question, copy and paste the appropriate output into your document.
Please submit your entire exam as one document. Ensure that everything is organized, easy to find, and easy to read. Points will be taken off otherwise.
There 8 questions. Be sure to answer all questions. Also, be aware that questions have multiple parts.
This take-home exam is to be submitted to Canvas by 1pm on Monday, October 12th. Late exams will have points deducted. Please see the syllabus for the late submission policy.
1) A developmental psychologist surveyed 15 single senior citizens living in private apartments. Each participant completed a questionnaire on the number of telephone conversations he or she had in the last day. Their answers were as follows: 5, 0, 2, 1, 1, 0, 1, 0, 3, 1, 1, 4, 3, 4, and 7.
(a) Using Jamovi, make a frequency table.
(b) Using Jamovi, make the appropriate chart for the data and explain why this is the appropriate chart
2) A psychologist interested in people's response to art had seven people indicate their liking for a particular piece of sculpture on a scale from 0-20 where higher scores mean more liking. Their ratings were 20, 17, 19, 18, 16, 18, and 19.
Using Jamovi, (a) compute the best measure of central tendency.
(b) Explain why this measure of central tendency is best.
3) 1, 2, 3, 4, 5, 6, 6, 8, 8, 8, 9, 10
(a) Hand calculate the mean
(b) Hand calculate the variance
(c) Hand calculate the standard deviation.
(d) Explain how you calculated variance and standard deviation. In your explanation, be sure to use the names of the concepts. For example, if you are calculating sum of squares call it that. Do not simply say “that number”.
(e) Why do you need standard deviation?
4) On a test of marital intimacy, husbands' scores are normally distributed with a mean of 140 and a standard deviation of 25.
Using the 50-34-14-2 approximation figures,
What percentage of husbands have scores above 190?
What percentage of husband have scores below 165?
What percentage of husbands have scores below 115?
5) On a standard test of optimism, scores of patients diagnosed with a particular disease are normally distributed with a mean of 20 and a standard deviation of 5.
Use the Normal Curve Table to determine the score a patient needs to be included
(a) among the top 5%
(b) among the top 20%
(c) among the bottom 10% of optimism scores.
6) Use Jamovi to answer the following questions. Include a screenshot from Jamovi showing how you calculated the information to answer the following questions as well as the data showing the calculated values.
A developmental psychologist was interested in how long it would take a particular 7-year-old child to complete three different aptitude tests as compared with 7-year-olds in the general population. The child's time for reading was 31 minutes (population: M = 29, SD = 4). For math, it was 26 minutes (population: M = 32, SD = 2). For science, it was 40 minutes (population: M = 31, SD = 4).
(a) What was the child’s best score?
(b) What was the child’s worst score?
(c) Explain how you know the answers to the above questions.
7) A music magazine has determined that the average length of a “pop” song on the radio is 3.75 minutes with a standard deviation of 0.75 minutes. A randomly selected “rock” song is 5 minutes. Using the .05 level of significance, is the length of “rock” songs longer than popular songs in general?
(a) Use the five steps of hypothesis testing.
(b) Draw a curve and label the cutoff(s), rejection region(s), and sample’s score.
(c) Provide an interpretation of the finding. This should be a one sentence interpretation free of statistical jargon.
8) A dermatologist is interested in whether a new treatment for poison ivy would affect symptoms at a different rate than the current treatment. In general, the current treatment completely eliminates symptoms after an average of 6 days, with a standard deviation of 1.2 days. One randomly selected patient given the new treatment had no symptoms after 5 days. Using the .05 level of significance, does the new treatment affect symptoms at a different rate than the current treatment?
(a) Use the five steps of hypothesis testing.
(b) Draw a curve and label the cutoff(s), rejection region(s), and sample’s score.
(c) Provide an interpretation of the finding. This should be a one sentence interpretation free of statistical jargon.
