mgsc 291 exam 1 Questions And Answers Already Graded A+
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Course
Mgsc 291
Institution
Mgsc 291
A political reporter announces that there is a 45% chance that the next person to come
out of the conference room will be a Republican, since there are 70 Republicans and 86
Democrats in the room.
A. Subjective probability
B. Empirical probability
C. Classical probability - ️️B
Bias can o...
mgsc 291 exam 1
A political reporter announces that there is a 45% chance that the next person to come
out of the conference room will be a Republican, since there are 70 Republicans and 86
Democrats in the room.
A. Subjective probability
B. Empirical probability
C. Classical probability - ✔️✔️B
Bias can occur in sampling. Bias refers to ______.
A. the division of the population into overlapping groups
B. the creation of strata, which are proportional to the stratum's size
C. the use of cluster sampling instead of stratified random sampling
D. the tendency of a sample statistic to systematically over- or underestimate a
population parameter - ✔️✔️D
If an observation is added to the high end of a distribution, the standard deviation -
✔️✔️increases
The standard deviation expressed as a percent of the mean is ________ _______
___________. it allows you to compare variation in datasets with different units or
means - ✔️✔️coefficient of variation
two events are ______ if they share no outcomes in common - ✔️✔️disjoint
P(A) + P(B) - P(A & B) - ✔️✔️addition rule
P (A and B) = P (A|B)* P (B) - ✔️✔️multiplication rule
fail/success is a _________ distribution - ✔️✔️binomial
1-pbinom(8,n,pi)
is the probability that _______ than __ - ✔️✔️more;8
pbinom(6,n,pi)
is the probability that _____ than __ - ✔️✔️less;7
dbinom(7,n,pi)
is the probability that _________ __ - ✔️✔️exactly;7
pnorm(86,mean,SD)-pnorm(15,mean,SD)
is the probability of being _______ __ and __ - ✔️✔️between;86;15
, qnorm(0.99,mean,SD)
is the ___ ___________ - ✔️✔️99th;percentile
a number that tells how many standard deviations above or below the mean a score is -
✔️✔️z-score
the special normal distribution that has a mean of 0 and a SD of 1 - ✔️✔️standard
normal distribution
a _______ varies from sample to sample - ✔️✔️statistic
the sample mean will have a normal distribution if the sample size is sufficiently large -
✔️✔️Central Limit Theorem
pnorm(35,mean,SD)/SQRT(50)
is the probability that the average of _____ customers will be ____ than ____ -
✔️✔️50;less;35
a _____ distribution uses S as the SD - ✔️✔️t
The two branches of the study of statistics are generally referred to as _____________
and _____________ - ✔️✔️descriptive;inferential
mean > median is skewed ______ - ✔️✔️right
median > mean is skewed _____ - ✔️✔️left
unimodal and symmetric distributions follow the __________ rule - ✔️✔️empirical
When should you choose a boxplot over a histogram?
When you want to make ________ ______ ______ comparisons - ✔️✔️side by side
which graphical display is best for showing change over time? - ✔️✔️line graph
Which measure of center can be used for a categorical (qualitative) random variable? -
✔️✔️mode
If an observation is added to the low end of a distribution, the standard deviation -
✔️✔️increases
In inferential statistics, we calculate statistics of sample data to
a. estimate unknown population parameters.
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