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Bluman Statistics Review Ch. 1- 6 Flashcards | StudBud
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Bluman Statistics Review Ch. 1- 6
Bluman Statistics Review Ch. 1- 6
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1
Which is true of an ogive?
it has bars like a hitogram
the x-axisis labeled with the midpoints of the classes
it only increases
2
Which student has a higher z-score?
Neither had a positive score, so cant't determine
Same score
Art major
Theater major
3
Which plot has a five-number summary of 5,6,7,9,12 and IQR of 3?
A
C
B
4
Empirical Rule states these percentages are within +/-1, 2, and 3 s.d. in normal distribution.
64-88-95.7
68-95-99.7
25-50-75
50-75-100
5
A random sample of weights of sapphires in a collection is shown. Find the mean.
5.69
5.95
10.6
5.59
6
Find the variance of the distribution given below:
-0.43
3.25
0.61
0.98
7
There are 4 stats books left & 6 students need one. How many different ways given out?
6C2
6C4
6P2
6P4
8
If a response is picked at random, what is the probability it came from a female and "yes"?
3/5
3/10
7/10
4/5
9
A sportscaster makes an educated guess on how well a team will do. This is:
empirical probability
conditional probability
subjective probability
classical probability
10
If a response is picked at random, what is the probability it came from a male or "no opinion"?
3/10
3/5
7/10
4/5
11
(Data: 81,99,77,67,93,70,76,86,79,71) How high is first bar of histogram if start with 61-70?
(70, 2)
(61, 2)
(65.5, 1)
(65.5, 2)
12
What branch of stats would attempt to predict the # of tornadoes in Kansas next year?
time series stats
differential stats
descriptive stats
inferential stats
13
Company has 20 techs, 4 engineers, 6 office, and 50 workers. What is prob of picking a worker?
5/8
2/5
1/8
1/4
14
Graphs that show proportions instead of frequencies are called
frequency polygons
ogives
relative frequency graphs
histograms
15
It is appropriate to have the following drawn horizontally:
bar graph
both bar graph and histogram
histogram
16
At store, mean years employed is approx. normal with mean = 5.7 and s.d. = 1.8. P( >10 yrs)?
49.2%
99.2%
1.7%
0.8%
17
A pie graph is
NOT
useful in showing:
catagory that makes up largest of smallest part of the total
frequency changes over time
relative frequencies for each catagory
18
A company says its car is rated higher by its customers than competitor's car. This is:
detached statistics
implied connections
changing the subject
suspect samples
19
Students record their eye colors. This data could best be recorded in:
an open-ended distribution
grouped freq. distribution
a categorical freq. distribution
upper distribution
20
If a normal distribution has a mean of 40 and a standard deviation of 5, then
the median is 40 and the mode is 45
the median is 35 and the mode is 45
the median is 40 and the mode is 40
the median is 45 and the mode is 35
21
College of 10,000, 45% male. Choose 30 at random. Mean & standard deviation of males?
Mean = 13.5, Variance = 7.4
Mean = 13.5, Variance = 2.7
Mean = 16.5, Variance = 7.4
Standard Deviation = 16.5, Variance = 2.7
22
What is the midrange of 3, 9, 8, 10, 16, 16, 15?
3
16
10
9
23
Find the expected value of the distribution given below:
4.25
3.44
3.01
2.31
24
In a class of 13 girls and 9 boys, 2 are selected for a job. What is prob they are both girls?
0.338
0.367
0.322
0.349
25
What is the area under the standard normal curve between z= 1.5 and z = 2.5?
0.0606
0.1001
<p>0.0802</p>
0.0764
26
A researcher offers one group a current medicine and the other a new medicine. This is:
an experimental study
an independent study
a confounding study
an observational study
27
A city is split into economic classes and then 25 men and 25 women from each class. This is:
stratified sampling
random sampling
cluster sampling
systematic sampling
28
The number of pets a family has is an example of what kind of variable?
continuous
qualitative
discrete
temporal
29
A coin is tossed five times. Prob of getting exactly three heads?
0.800
0.313
0.125
0.156
