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CIS 3300 Exam 1 Flashcards | StudBud
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CIS 3300 Exam 1
CIS 3300 Exam 1
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Statistics
Flashcards
13 cards
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Questions
13
Answers
1
Why create a random sample?
to calculate Z scores
to understand sampling
none of these
to infer a population parameter
2
With a mean age of 45 and a SD of 5, two SDs below the mean would be:
-35 years old
25 years old
0 years old
35 years old
3
What is a sampling distribution?
all of these
a theoretical distribution
all possible samples of a population
a distribution of statistics from all possible samples
4
Calculating the standard deviation requires knowing:
mode
mean
pixel
median
5
Bar graphs and pie charts do not work well with ________ level of data.
works with none of these
ordinal
nominal
interval/ratio
6
The standard deviation tells us:
the standard amount of deviation allowed
the average squared distance of the samples from the mean
the average distance of the samples from the mean
the amount that the variance deviates from the whole
7
To obtain the standard deviation, one must take the _________ of the _________ .
median, mode
deviation, population
mode, sample
square root, variance
8
When considering the normal curve, roughly what % of the cases are above +1 standard deviation?
10%
0%
5%
15%
9
As the size of a random sample increases, the sample mean is
a better approach to the population mean
none of these
closer to a full moon
less likely to reflect a normal curve
10
Roughly what percentage of cases fall between -1 and +1 standard deviations?
90
68
0
35
11
An inferential statistic makes an inference about a population based on a sample.
True
False
12
In a
binomial experiment
, what is the meaning of "
p
"?
Is any probability given in the problem
It's the probability of failure in n trials
It's the probability of success
It's the probability of n= 10
13
What is a systematic sample?
applying a skip interval to create a random sample
all of these
a means of avoiding a random sample
a sample of strata
