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Bluman Statistics Review Ch. 1- 6 version 2 Flashcards | StudBud
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Bluman Statistics Review Ch. 1- 6 version 2
Bluman Statistics Review Ch. 1- 6 version 2
28 terms
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#Bluman, #McGrawHill, #ElementaryStatistics #IntrotoStats
Flashcards
28 cards
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Questions
28
Answers
1
Find the variance of the distribution given below:
0.2
0.6
0.8
1.2
2
At store, mean years employed is approx. normal with mean = 5.7 and s.d. = 1.8. P( >10 yrs)?
99.2%
49.2%
0.8%
1.7%
3
Find the expected value of the distribution given below:
1.65
1
0.33
0.6
4
Graphs that show proportions instead of frequencies are called
frequency polygons
histograms
ogives
relative frequency graphs
5
A random sample of weights of sapphires in a collection is shown. Find the mean.
10.6
5.59
5.69
5.95
6
If a normal distribution has a mean of 40 and a standard deviation of 5, then
the median is 45 and the mode is 35
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
7
In class of 15 girls & 13 boys, 2 selected to student gov't. What is prob get boy then girl?
0.224
0.249
0.250
0.258
8
What is the area under the standard normal curve between z= 0.8 and z = 2.3?
0.2012
0.0252
.7881
.9893
9
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
10
Students record their eye colors. This data could best be recorded in:
an open-ended distribution
a categorical freq. distribution
upper distribution
grouped freq. distribution
11
College has 45% freshman. Choose 30 at random. Mean & standard deviation of freshman?
Standard Deviation = 16.5, Variance = 2.7
Mean = 13.5, Variance = 7.4
Mean = 16.5, Variance = 7.4
Mean = 13.5, Variance = 2.7
12
Which plot has a five-number summary of 5,6,7,9,12 and IQR of 3?
B
C
A
13
What is the midrange of 3, 9, 8, 10, 16, 16, 15?
16
3
9
10
14
A researcher offers one group a current medicine and the other a new medicine. This is:
a confounding study
an independent study
an experimental study
an observational study
15
Which student has a higher z-score?
Neither had a positive score, so cant't determine
Art major
Same score
Theater major
16
Your college major is what kind of variable?
continuous
qualitative
temporal
discrete
17
If a response picked at random, what is the probability NOT plays instrument and plays sport?
2/5
17/20
19/20
1/10
18
A dice is rolled three times. Probability of rolling greater than 4, then a 6, then an even?
5/6
1/36
1/6
1/3
19
What branch of stats would attempt to predict the number of tornadoes in Texas next year?
time series stats
inferential stats
differential stats
descriptive stats
20
There are five seats left on a bus. How many different ways for eight people to sit?
8P3
8C3
8C5
8P5
21
A company says its car is rated higher by its customers than competitor's car. This is:
changing the subject
suspect samples
detached statistics
implied connections
22
Empirical Rule states these percentages are within +/-1, 2, and 3 s.d. in normal distribution.
25-50-75
50-75-100
64-88-95.7
68-95-99.7
23
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
24
From a study, news report says 9/10 of people in Kansas City still drive if it snows. This is:
empirical probability
classical probability
subjective probability
conditional probability
25
Response is picked randomly, what is the prob. it came from NOT instrument or NOT sport?
19/20
3/5
7/20
3/20
26
Vacation survey: 100 beach, 64 Disneyworld, 36 snow skiing. What is probability prefer beach?
1/4
1/10
1/8
1/2
27
A survey is split into economic classes & then 25 men and 25 women from each class. This is:
systematic sampling
stratified sampling
cluster sampling
random sampling
28
It is appropriate to have the following drawn horizontally:
both bar graph and histogram
histogram
bar graph
