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What happens to the width of a confidence interval when the sample size increases?

What does the 90th percentile represent in a normal distribution?

Stunde 8

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Answers

1
What does the 90th percentile represent in a normal distribution?
The mean of the distribution
The probability of an extreme event
The sum of all observations
The value below which 90% of observations fall
2
What happens to the width of a confidence interval when the sample size increases?
It stays the same
It gets wider
It gets narrower
It becomes infinite
3
What does the standard deviation measure?
The probability of an event
The middle value of a dataset
The highest value in a dataset
The spread of data from the mean
4
What does a 95% confidence interval mean?
The probability of the estimate being correct is 95%
The data is always normally distributed
The interval contains the true value in 95% of all possible samples
The sample mean is exactly the population mean
5
Whatprobability distribution is used to model the number of attendees in a meeting (each same prob.) of attending?
Normal
Poisson
Uniform
Binominal
6
What is a probability distribution?
A type of graph
A random event
A function describing possible outcomes and their probabilities
A list of numbers
7
Which probability distribution is used when rolling a die multiple times and counting specific outcomes?
Binomial
Poisson
Normal
Exponential
8
Which of the following confidence levels corresponds to an alpha level (α) of 0.01?
95%
90%
99,5%
99%
9
What is the purpose of a confidence interval in statistics?
To find the probability of an event
To estimate a population parameter
To rank different distributions
To determine sample size