There are five worksheets associated with this course.
The worksheets are handed out at the lectures.
Complete the worksheets at your own leisure but remember "PRACTICE MAKES PERFECT". In the past most students who have completed all the worksheets have done alright on the exam at the end of the course. On the other hand, students who have completed none of the worksheets have had problems.
If you have problems with a worksheet send me an e-mail. When there are sufficient questions I will post the questions and answers in a FAQ (frequently asked questions) page.
My e-mail address is pal@psychology.nottingham.ac.uk.
I will endeavour to reply to such messages within seven days of receipt of the message.
The following data represents the ages of people who take part in a popular tv quiz.
10.97 22.04 29.24 35.25
12.04 22.30 29.31 37.35
12.17 22.38 29.45 37.84
13.51 26.20 29.71 38.79
18.31 27.47 30.03 39.02
19.36 27.76 30.04 40.27
19.39 27.83 30.20 42.54
20.06 27.83 32.52 43.58
20.98 29.05 34.01 44.25
21.69 29.06 34.12 48.79
The data below represents the number of correct answers that the above people scored in the quiz
1 4 5 8
1 4 6 8
1 4 6 8
1 5 6 8
1 5 7 8
1 5 7 9
3 5 7 9
3 5 7 9
3 5 8 9
4 5 8 9
For both these sets of scores:
Q1. A newsnight report showed that the results of polling 100 people on their preferences for who should be Prime Minister had the following results.
John Major 25
Tony Blair 38
Paddy Ashdown 26
None of the above 11
(a) Calculate a Pearson's chi-square for this data.
(b) Using residuals say what you can conclude?
Q2. On the same newsnight programme a second poll of both American and English people living in London were asked to judge who would be the best president of the US. They found
American English
George Bush 36 32
Ross Perot 21 13
Bill Clinton 43 55
(a) Calculate a Pearson's chi-square for this data.
(b) Using residuals say what you can conclude?
Q1. A psychophysiologist would like to know if a new antibiotic has any effect on Rapid Eye Movement (REM) sleep. A group of 8 healthy students were recruited for the study. The subjects spend two sessions in a sleep laboratory having their sleep recorded. During one session they are given the anitbiotic and during the other session a placebo. The two conditions are counterbalanced and on neither occasion are the subjects told whether it is th e antiobioti c or the placebo they have taken. The number of minutes of REM sleep in the two conditions are shown below.
Placebo Antibiotic
100 120
125 117
101 96
114 111
95 106
128 140
120 131
104 110
(a) Test whether there is a difference in the number of minutes of rem sleep using a non-parametric test
(b) Write a short summary of the results.
Q2. A researcher wants to know if the time taken to read is different depending on the colour of the words. One group of subjects read aloud 10 words written in black and a different group of subjects read the same words written in red. The total time (in seconds) taken to read the list of words was measured for each group. The results are shown below.
Black Red
4.0 4.6
4.5 4.7
3.7 4.6
3.8 4.8
4.0 5.0
4.2 8.0
3.6 4.9
(a) Test whether there is a difference in the number of second taken to read the two lists using a non-parametric test.
(b) Write a short summary of the results.
Q1. Twelve subjects are randomly allocated to one of three groups: Group 1: no sleep deprivation; Group 2: one night's sleep deprivation; Group 3: two night's sleep deprivation. After this period of sleep or no sleep subjects were asked to listen to a continuous series of tones and indicate when target tones occur. The target tones are ones that are slightly longer in duration than the rest. The experimenter believes that the increasing sleep loss will impair performance on the vigilance task but has no real idea of the form of any relationship between sleep loss and performance. The data below shows the number of times target stimuli that were successfully detected.
0 nights 1 night 2 nights
28 19 16
26 17 14
22 13 10
20 11 8
(a) Test whether the amount of sleep deprivation has any effect on the vigilance task using a non-parametric statistical test.
(b) Write a short summary of the results.
Q2. Certain patterns of stripes can often induce illusions of colour, shape and motion. A researcher would like to know whether the number of visual illusions reported varies as a function of time of day. Six subjects were presented with a serioes of horizontal gratings (the name given to the patterns of stripes) on three consecutive days at three different times of day: morning, afternoon and evening. The order of the three conditions was counterbalanced across subjects. The number of illusions induced by the gratings is measured by a checklist that the subjects complete after viewing each figure. The data is shown below.
Morning Afternoon Evening
10 12 8
9 12 9
11 11 9
12 14 10
10 15 6
8 11 5
(a) Test whether the number of illusions reported differs according to time of day using a non-parametric statistical test.
(b) Write a short summary of the results.
Q1. A common relationship shown in the psychology literature is between Grade Point Average (GPA) and Intelligence Quotient (IQ). A researcher has conducted a study looking at the relationship between academic performance and earnings (net monthly income). The researcher wants to know whether they should take IQ into account so they collect data on IQ as well as GPA. They obtain the following data.
IQ GPA Salary (net)
100 4.0 £400
104 4.8 £860
106 4.6 £890
108 4.2 £1000
110 5.6 £990
112 5.4 £875
116 5.0 £950
120 5.8 £760
124 5.2 £1000
130 6.2 £890
(a) Calculate Pearson's Correlation Coefficient for the relationship between IQ and GPA.
(b) What is the above relationship and is it significant?
(c) Calculate Spearman's Rank Correlation Coefficient for the relationship between GPA and Salary
(d) What is the above relationship and is it significant?
(e) Plot Scattergraphs for the two different correlations calculated.
|
|
|
|
|