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Review for MTH 207 Final Exam
Review for MTH 207 Final Exam
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A quiz to help students review the material for the final exam in Intro to Statistics
Flashcards
20 cards
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Questions
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Answers
1
The distribution of the statistics over all possible samples is called the
sampling variability
the sampling distribution
the population
the distribution of the sample
2
You pick 3 cards w/o replacement, what is the probability that at least one is a king?
1-(4/13)(3/12)(2/11)
(4/52)(3/52)(2/52)
1-(48/52)(47/51)(46/50)
(48/52)(47/52)(46/52)
3
We have a 95% confidence interval. To create a more narrow one without losing confidence, we
change the value of p-hat
change the z* value to a smaller number
increase the sample size
decrease the sample size
4
In a Normal Model, a data point that is 3 standard deviations below the mean
is greater than approximately .15% of the data
has a z-score of 3
is not very unusual
is the 99th percentile
5
A variable that is not mentioned, but changes the relationship between the variables.
continuous variable
independent variable
lurking variable
dependent variable
6
A correlation of 1 means
a perfect linear relationship
we can conclude causation
there is no linear relationship
a weak linear relationship
7
Two events are mutually exclusive if
They are independent
They are dependent
They have exactly one outcome in common
They have no outcomes in common
8
Complete the following analogy-- population: parameter, sample:-------------
statistic
survey
size
mean
9
If we reject the null hypothesis, which of the following is
NOT
necessarily a valid conclusion:
Our decision is statistically significant.
If the alpha level were higher, we would still reject H0
We are unlikely to see data this unusual, given H0 is true.
Our decision is of practical significance
10
In a hypothesis test, if the P-value falls below the alpha level, we
accept the null hypothesis
reject the alternative hypothesis
reject the null hypothesis
fail to reject the null hypothesis
11
The third quartile of a set of data is
the upper fence
always the same distance from the mean
2 standard deviations above the mean
the 75th percentile
12
Find a 95% confidence interval for a sample of size 30 with mean 15.7 and sd 4.6.
(13.39, 18.02)
(13.01, 19.55)
(13.98,17.42)
(14.05, 17.35)
13
Events A and B are independent when
P(A and B) = P(A) * P(B)
P(A|B) = P(A)
Learning that B has occurred does not change P(A)
All of the above
14
Choosing every 10th person who walks into the library to answer your survey will result in a
simple random sample
cluster sample
systematic sample
stratified sample
15
A Standard Normal model has what mean and standard deviation?
different for every sample
mean = 0 and sd = 1
mean = 100 and sd = 10
mean = 1 and sd = 0
16
The median is
the 50th percentile
all of the above
a measure of center especially for skewed data
the 2nd quartile
17
The probability of an event not occurring is ...
independent of the probability of the event
1 minus the probability that is does occur
equal to the probability that it does occur
not possible to determine from the probability of the event
18
A number which measures the strength and direction of a linear relationship is a
correlation coefficient
probability
residual
regression
19
Find P(draw 3 spades) without replacement, standard deck of cards
(1/4)(1/3)(1/2)
(13/52)(13/52)(13/52)
(13/52)(12/51)(11/50)
(4/13)(3/13)(2/13)
20
The sampling distribution model of the sample mean from a random sample is approximately normal
Nearly Normal Condition
Bernoulli Trial
Central Limit Theorem
Law of Large Numbers
