Scm Sample Questions Test 1

Front 1

quantitative data can be considered categorical data..true or false?

Back 1

False

Front 2

A descriptive measure of a sample is a paramter (T/F)

Back 2

False

Front 3

we should determine our objectives of a study before we collect data. (T/F)

Back 3

True

Front 4

the numbers on a basketball jersey are an example of qualitative data. (T/F)

Back 4

True

Front 5

a data set that is skewed negative has most of the data values on the left with a few on the right. (T/F)

Back 5

False

Front 6

a stem and leaf plot is useful because it shows..

Back 6

the distribution AND contains all values

Front 7

the first quartile of a distribution can never be less than zero. (T/F)

Back 7

False...

ex: temperature

Front 8

a population consists of the numbers 3, 8, and 4. The mean and median, respectively, are...

Back 8

5, 4

Front 9

the median and mode are not affect by outlier values. (T/F)

Back 9

True

Front 10

every data set has a mode. (T/F)

Back 10

False

Front 11

median is a measure of variability. (T/F)

Back 11

false

Front 12

range is sensitive to all data values. (T/F)

Back 12

False

Front 13

if we want the average of all the deviations fromt he mean of a data set, we can simply add teh deviations and divide by n. (T/F)

Back 13

false, you'd get 0 every time.

Front 14

The following measures of variation measure distance from mean: MAD, variance, IQR, MAD & variance

Back 14

MAD & variance

Front 15

the MAD of four number 6, 14, 14, 14 is equal to: 0, 1, 2, 3

Back 15

3

Front 16

the units of a population MAD for aproblem in which the units are feet are: feet squared, the absolute value of feet, feet, no units

Back 16

feet

Front 17

a population has three values: 3, 7, 5. Find the population variance: 0, 2.67, 1.63, 4, 2

Back 17

2.67

Front 18

a population consisted of the values 3, 7, 11, 11, 13. the population std. deviation is: 12.8, 3.58, 16, 4

Back 18

3.58

Front 19

a sample consisting of the numbers 3, 6, 9 has sample variance equal to 12.

Back 19

false, 9

Front 20

the numebr of hours a child spent watching TV over thh pas three day was 15, 3, 9. Compute sample std. dev: 24, 6, 3, 2

Back 20

6

Front 21

a std deviation can sometimes be larger in numerical value than a variance

Back 21

true

Front 22

the coefficient of variation computed from the three samples values 15, 20, and 25 would be equal to 25

Back 22

true

Front 23

95% of data values that conform to a bell shaped distribution will lie within how many std devs of the mean? 0, 1, 2, 3

Back 23

2

Front 24

the coefficient of variation computed from 3 sample values 25, 30, 35 would be equal to 20.

Back 24

false, 16.66

Front 25

student score = 70
class mean = 80
std dev = 5
the standard score is equal to 2.

Back 25

true

Front 26

positive kurtosis indicates more extreme values than expected in the tail of a distribution

Back 26

true

Front 27

a boxplot is a good way to show the mean

Back 27

false

Front 28

generally speaking, a stem and leaf plot cannot be constructed from a boxplot, but a boxplot can be constructed from a stem and leaf plot

Back 28

true

Front 29

not all mutually exclusive events are complementary

Back 29

true

Front 30

all complementary events are mutually exclusive

Back 30

true

Front 31

drawing an ace of spades and a three of hearts are complementary

Back 31

false

Front 32

the items in a sample space must be: complementary, exhaustive, random, comp and exhaustive

Back 32

exhaustive

Front 33

whats it the most common approach to determining probability

Back 33

relative

Front 34

when a probability is described in terms of the propportion of times that an event can be theoritically epxcted to occur, it is an example of relative frequency probability

Back 34

false, theoretical

Front 35

a couple palsn to have three kids assuming male/female birthday are equally likely, what is the probability that the couple will have at least one girl among the three children:
1/3, 2/3, 3/8, 7/8

Back 35

7/8

Front 36

order matters when making a sample space

Back 36

true

Front 37

when one throws a die 1000 times and determines the probability of obtaining a six on a die is one-sixth, they used theoretical.

Back 37

false, relative

Front 38

3 pairs of socks, whats the prob that you will get a pair? 2/3, .2, .8, .75

Back 38

.2

Front 39

the distribution of people's heights is an example of a discrete probability distribution

Back 39

false

Front 40

the sum of the probabilites in a discrete probability distribution could total 1.2

Back 40

false it has to be 1

Front 41

probabilities associated with random variables must all be equal

Back 41

false

Front 42

x=10, 9, 8, 7, 6. f(x)=3, 2, 1, 2, 2
e(x) = ?
8, 8.2, 9, 7.8

Back 42

8.3

Front 43

x=1, 3, 5. p(x)=.4, .2, .4
variance = ?
1.6, 4, 8/3, 3.2

Back 43

3.2

Front 44

x=20, 30, 60
p(x)=.5, .4, .1
std dev(x)=?
4.29, 18.4, 19, 361

Back 44

19

Front 45

non-random samples involve unequal probabilities

Back 45

true