For a continuous probability distribution, the total area under the curve is equal to
What is one?
100
The cost of studying all the items in a population may be prohibitive.
What is a reason to sample?
100
The sample mean can be used as the ________of the population parameter.
What is the point estimate?
100
A statement about a population parameter subject to verification.
What is a hypothesis?
100
What are the two most common level of significance's when testing a hypothesis?
What is .05 and .01?
200
What is the probability of a z value between 0 and -0.76?
What is .0450?
200
The process of selecting items from a population to use this information to make judgments or inferences about the population.
What is sampling?
200
When the population standard deviation is known, 95% of all confidence intervals computed will use the z-statistic equal to:
What is 1.96
200
H sub one is used to represent
What is the alternate hypothesis?
200
The fifth step in testing a hypothesis is:
What is make a decision?
300
How many normal distributions are there? (1, 10, 30, or infinite)
What is infinite?
300
A sample selected so that each item or person in the population has the same chance of being included.
What is simple random sampling?
300
Assuming the population is normal and the standard deviation is unknown, what do you use to calculate the confidence interval?
What is the t-distribution?
300
Not rejecting the null hypothesis when it is false
What is a type II error?
300
A population is divided into clusters using naturally occurring geographic or other boundaries. Then, clusters are randomly selected and a sample is collected by randomly selecting from each cluster.
What is cluster sampling?
400
Which of the following is NOT a characteristic of the normal distribution?
What is discrete?
400
A population is divided into subgroups, called strata, and a sample is randomly selected from each stratum.
What is stratified random sampling?
400
When the standard deviation is known, 90% of all confidence intervals are computed using a z-statistic equal to:
What is 1.65?
400
The probability of rejecting the null hypothesis when it is true.
What is the level of significance?
400
A sample of 49 observations is taken from a normal population with a standard deviation of 10. The sample mean is 55. Determine the 99% confidence interval for the population mean.
What is 51.32 and 58.68?
500
For a normal distribution, what is true about the mean and median?
What is always equal?
500
The difference between a sample statistic ans its corresponding population parameter.
What is sampling error?
500
What equation would you use to calculate the degrees of freedom?
What is n-1?
500
Selecting the test statistic is:
What is the third step in testing a hypothesis?
500
A normal population has a mean of 60 and a standard deviation of 12. You select a random sample of 9. Compute the probability the sample mean is greater than 63.