stats unit 2
If calculations are time-consuming and if a sample size is no more than 5% of the size of the population, the _______ states to treat the selections as being independent (even if the selections are technically dependent).
5% Guideline for Cumbersome Calculations
Which of the following would be information in a question asking you to find the area of a region under the standard normal curve as a solution?
A distance on the horizontal axis is given
Indicate a similarity between a Poisson distribution and a binomial distribution.
Both distributions have an independence requirement.
In the binomial probability formula, the variable x represents the
In the binomial probability formula, the variable x represents the number of successes.
For the binomial distribution, which formula finds the standard deviation?
Square root of npq
The standard deviation of the Poisson distribution is calculated using _______.
Square root of u
Which of the following is NOT a descriptor of a normal distribution of a random variable?
The graph is centered around 0.
Which of the following does NOT describe the standard normal distribution?
The graph is uniform.
What requirements are necessary for a normal probability distribution to be a standard normal probability distribution?
The mean and standard deviation have the values of 0 and 1
Which of the following is NOT a requirement of the Poisson Distribution?
The occurrences must be dependent.
Which of the following is not a requirement of the binomial probability distribution?
The trials must be dependent.
Which of the following groups of terms can be used interchangeably when working with normal distributions?
areas, probability, and relative frequencies
Finding probabilities associated with distributions that are standard normal distributions is equivalent to _______.
finding the area of the shaded region representing that probability
Identify the expression for calculating the mean of a binomial distribution.
np
The _______ distribution is a discrete probability distribution that applies to the number of occurrences of some event over a specified interval.
poisson
A main goal in statistics is to interpret and understand the meaning of statistical values. The _______ can be very helpful in understanding the meaning of the mean and standard deviation.
range rule of thumb
Which of the following is NOT a requirement for a density curve?
the graph is centered around 0
The notation P(z<a) denotes _______.
the probability that Z score is less than A
A continuous random variable has a _______ distribution if its values are spread evenly over the range of possibilities.
uniform
Which of the following is NOT one of the three methods for finding binomial probabilities that is found in the chapter on discrete probability distributions?
using a simulation
