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  • 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...

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  • November 26, 2024
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  • 2024/2025
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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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