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Psychology 2800E
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Riley Hinson
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Midterm

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Psychology

Psychology 2800E

Riley Hinson

Fall

Description

Sample Questions Everything to 3 decimal points!
1. Which of the following are discrete and which are continuous variables?
(a) Distance in km
(b)Number of bar presses a rat makes
(c) Number of students
(d)Fuel consumption in mpg
2. Identify the scale of measurement
(a) Likert scale (1=very likely, 5=very unlikely, etc.)
(b)Basketball player’s uniform number
(c) Weight of objects
(d)Clothing sizes
(e) Volume of bottles
3. Draw a stem and leaf plot for these values
85 91 62 64 71 71 75 79 81 73
64 80 63 60 72 73 75 76 71 70
69 90 81 82 71 76 78 79 52 40
63 69 36 75 84 74 74 63 62 30
4. What is the mode for question 3?
5. What is the median for this data set?
5.41 1.67 2.39 1.35 5.38 3.56 4.38 4.93 4.61 2.98 2.98 4.87 2.07 2.23 2.50
6. A group of 15 rats running a straight-alley maze required the following
number of trials to reach a predetermined criterion. The frequency
distribution is:
Number of Trials 18 19 20 21 22 23 24
Number of rats (freq) 1 0 4 3 3 3 1
(a) What is the mode, median and mean?
(b)Is the variable continuous or discrete?
(c) What scale (nominal, ordinal, i/r) are we using?
7. An individual’s level of fitness can be determined by the number of liters of
oxygen consumed per minute (VO2 max) during a stress test. During this test,
an individual rides a cycle ergometer as fast as possible until exhausted. The
volume of oxygen consumed in each breath is recorded by a mass
spectrometer. Taking body size into account, the higher the oxygen
consumption, the fitter the individual.
Data (in litres per minute) collected from a sample of 30 male university students
are:
23 36 56 42 28 31 62 19 21 25
38 36 22 51 69 25 33 38 29 25
22 24 37 44 42 33 31 38 36 39 VO2 max (L/min) data from 30 female university students are:
18 36 23 45 61 19 21 23 33 36
45 36 38 44 49 52 53 48 23 16
33 39 25 29 29 41 60 33 39 20
(a) What is the mean VO2 max for males?
(b) What is the mean VO2 max for females?
(c) What is the mode for males?
(d) What is the median value for males?
8. Find the IQR
Stem Leaf
0 339
1 00159
2 8
3 26
9. Find the IQR and draw a boxplot
23 36 56 42 28 31 62 19 21 25
38 36 22 51 69 25 33 38 29 25
22 24 37 44 42 33 31 38 36 39
10.An individual’s level of fitness can be determined by the number of liters of
oxygen consumed per minute (VO2 max) during a stress test. During this test,
an individual rides a cycle ergometer as fast as possible until exhausted. The
volume of oxygen consumed in each breath is recorded by a mass
spectrometer. Taking body size into account, the higher the oxygen
consumption, the fitter the individual.
Data (in litres per minute) collected from a sample of 30 male university
students are:
23 36 56 42 28 31 62 19 21 25
38 36 22 51 69 25 33 38 29 25
22 24 37 44 42 33 31 38 36 39
(a) What is the interquartile range?
11.An individual’s level of fitness can be determined by the number of liters of
oxygen consumed per minute (VO2 max) during a stress test. During this test,
an individual rides a cycle ergometer as fast as possible until exhausted. The
volume of oxygen consumed in each breath is recorded by a mass
spectrometer. Taking body size into account, the higher the oxygen
consumption, and the fitter the individual. Calculate variance.
Data (in litres per minute) collected from a sample of 30 male university
students are: 23 36 56 42 28 31 62 19 21 25
38 36 22 51 69 25 33 38 29 25
22 24 37 44 42 33 31 38 36 39
12.The distribution of heights of females is normally distributed with a mean of
65 inches and a standard deviation of 2.5 inches. What would be the z score
of a woman who is 70 inches tall?
13. A university decides A’s are given to students above the 80th percentile (not
a grade of 80). In a class with mean of 65.0 and standard deviation of 15.0,
what grade gets an A?
14.Intelligence test scores are normally distributed with a mean of 100 and a
standard deviation of 15.
(a) What is z for an IQ score of 127?
(b)What percent of the population has an IQ score equal to or greater than
127?
(c) What percentage of the population has an IQ score equal to or greater
than 70?
(d)What IQ score would fall at the 95th percentile?
(e) What proportion of IQ scores is between 80 and 125?
15.What proportion of all Z scores are either ≥ +1.96 or ≤ -1.96?
16.A particular test taken by applicants to law school has a mean of 500 and a
standard deviation of 100. Mary has been told that in order to be admitted to
th
law school she has to make a score that is at least at approximately the 90
percentile. What is the minimum score that Mary can make to be admitted to
law school?
17.Charles Darwin discovered a strange species of shrubs on a remote island
and recorded their heights in inches of 800 plants. The distribution of their
heights is mound shaped and symmetrical and has a variance of 9. One plant,
whose height was 4 inches, falls at the 33 p

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