Basics of Statistics
When symmetrical, a skewness score will equal…
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What does the function "AVERAGE" compute?
The mean of a set of numbers
This provides a numerical description of the outcome of an experiment?
What is a Random Variable?
What does n represent?
# of times an experiment is done
What is called a parameter.
A numerical characteristic of a population, such as a population mean u, a population standard deviation o, a population proportion p, and so on.
What is a "sample" of a given amount of data?
A portion of the whole data.
Excel uses dollar signs ($) to indicate that...
A reference is fixed
This describes how the probabilities are distributed over the values the random variable can assume?
What is the Probability Distribution for a Random Variable?
What does p represent?
Probability of something happening
When we refer to simple random sampling, what are we assuming?
we will asume the samplingis without replacement.
Probabilities are only numbers between _and _
0 and 1
What must an excel formula always start with?
An equals (=) sign
This type of distribution is used when it is desirable to determine the probability of obtaining x occurrences over an interval of time or space.
What is the Poisson distribution?
What does the highest point of the normal curve tell us?
The highest point is the mean which can also be interpreted as the median and mode
A population where it's possible to count its individuals is called?
What is Finite Population.
What does descriptive statistics consist of?
Consists of the collection, organization, summarization, and presentation of data
What are the 3 steps taken to create a chart based on the data given?
This type of distribution is used to compute the probability of x successes in n trials, but the probability of success changes from trial to trial?
What is Hypergeometric distribution?
What does the area under a graph of f(x) represent between x1 and x2?
The area under a graph of f(x) between x1 and x2 represents probability
What is the parameter?
A numerical descriptive measure of a population
What is the goal of statistics?
"To make better decisions using data in the presence of uncertainty."
What are the four areas of a pivot table?
Filters, Columns, Rows, and Values
This type of distribution is used to determine the probability of success of x successes in n trials, when the trials are independent, the probability of success does not change from trial to trial, and there are two outcomes possible in each trial?
What is a Binomial distribution?
68 (% of the values fall within 1 standard deviation of the mean)
95 (% of those values fall within 2 standard deviations of the mean)
99.7 (% of the values fall within 3 standard deviations of the mean)
If the value of p=.50, then it can be concluded that pbar=__
.50