A random variable that can assume only a finite number of values
What is a discrete random variable
100
This value of the standard normal distribution can be either negative or positive.
What is the z-score?
100
A simple random sample of 144 observations was taken from a large population. The sample mean and standard deviation were determined to be 50 and 8 respectively. The standard error of the mean is
What is .667?
100
For the interval estimation of the population mean when sigma, the population standard deviation, is known and the sample is large, this is the proper distribution to use
What is the normal distribution (z-score table)
100
When the p-value is less than alpha, you conclude this about your null hypothesis
What is reject the null?
200
Any value in an interval or collection of intervals
What is a continuous random variable
200
A continuous probability distribution where the probability that the random variable assumes a value in any interval of equal length is the same for each interval
What is a uniform probability distribution?
200
As sample size increases, this statistic decreases
What is standard error of the mean?
200
When the population standard deviation is unknown, and the population has a normal or near-normal distribution, this is the distribution to use in developing an interval estimation.
What is the t distribution?
200
The alternative hypothesis is determined to be true when this is determined from the sample statistics.
What is reject the null?
300
The sum of f(x) = 1 for all values of x is a condition this probability function.
What is a required condition for a discrete probability function?
300
A wider and flatter normal curve is based on a larger value of this statistic.
What is standard deviation?
300
When a sample statistic is used to estimate the population parameter, the sample statistic serves as this.
What is a point estimate?
300
The value added to and subtracted from a point estimate in order to develop an interval estimate of a population parameter.
What is the margin of error?
300
This type of error occurs if you reject the null when, in fact, it is true.
What is a Type I error?
400
The correct probability function to use if you are interested in the probability of x successes in n trials.
What is binomial probability function?
400
The random variable x is known to be uniformly distributed between 60 and 80. The probability of x having a value between 70 and 80.
What is .5?
400
The probability distribution consisting of all possible value of a sample statistic, usually the mean.
What is a sampling distribution?
400
In order to determine an interval for the mean of a population with unknown standard deviation a sample of 45 items is selected. The mean of the sample is found to be 18. The number of degrees of freedom for reading the t value is this.
What is 44.
400
In hypothesis testing, you are doing a right tail test and obtain a z score of 2.2. This would be your p value.
What is .0139
500
The appropriate probability distribution when dealing with the number of occurrences of an event over a specified interval of time or space.
What is the poisson distribution?
500
Z is a standard normal random variable. The P(-1.2
What is .8621?
500
A population has a standard deviation of 18. If a sample of size 81 is selected from this population, the probability that the sample mean will be within plus or minus 2 of the population mean is this.
What is .6826?
500
A population has a standard deviation of 12. A random sample of 36 items from this population is selected. The sample mean is found to be 45. At 95% confidence this is the margin of error.
What is 3.92?
500
A value that is compared with the test statistic to determine whether the null hypothesis should be rejected.