EXST 2201 EXAM QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS GRADED A++
What is the appropriate situation to use a t-distribution?
When know s, but don't know σ.
A confidence interval is used to infer the sample average.
False
The population mean must be known to calculate a confidence interval.
False
Click the two reasons that the method of hypothesis testing is needed.
To find out how reasonable a chosen value is the population mean
To find out if the population mean is less than, or greater than, a chosen value
In hypothesis testing, what does reasonableness mean?
How close a chosen value is to the population mean
Click the two assumptions needed for the method of hypothesis testing.
The individuals were randomly selected
The sample average is normally distributed
Why is the method of hypothesis testing called an inferential method of
statistics?
, Because it gives the best guess (infers) from the sample for the value of the population
mean
How does the method of hypothesis testing make an inference (i.e. draw a
conclusion) about a population mean?
By seeing if the test statistic is closer to zero (0), or farther from zero, than the critical
value
Click all choices that are steps in Step A: Abstract of the General Method to solve
problems in statistics.
Get descriptive statistics from the sample data values
Write a set of two hypotheses about the researcher's question
The null hypothesis always contains an equal sign
True
Click all choices that are steps in Step 1: Theorize of the General Method to solve
problems in statistics
Use the schematic curve to analyze the situation from a statistical point of view
Find the appropriate critical value(s) for this situation
Click all choices that are steps in Step 2: Analyze of the General Method to solve
problems in statistics.
Calculate the test statistic from sample information
Find the p-value from the test statistic
COMPLETE SOLUTIONS GRADED A++
What is the appropriate situation to use a t-distribution?
When know s, but don't know σ.
A confidence interval is used to infer the sample average.
False
The population mean must be known to calculate a confidence interval.
False
Click the two reasons that the method of hypothesis testing is needed.
To find out how reasonable a chosen value is the population mean
To find out if the population mean is less than, or greater than, a chosen value
In hypothesis testing, what does reasonableness mean?
How close a chosen value is to the population mean
Click the two assumptions needed for the method of hypothesis testing.
The individuals were randomly selected
The sample average is normally distributed
Why is the method of hypothesis testing called an inferential method of
statistics?
, Because it gives the best guess (infers) from the sample for the value of the population
mean
How does the method of hypothesis testing make an inference (i.e. draw a
conclusion) about a population mean?
By seeing if the test statistic is closer to zero (0), or farther from zero, than the critical
value
Click all choices that are steps in Step A: Abstract of the General Method to solve
problems in statistics.
Get descriptive statistics from the sample data values
Write a set of two hypotheses about the researcher's question
The null hypothesis always contains an equal sign
True
Click all choices that are steps in Step 1: Theorize of the General Method to solve
problems in statistics
Use the schematic curve to analyze the situation from a statistical point of view
Find the appropriate critical value(s) for this situation
Click all choices that are steps in Step 2: Analyze of the General Method to solve
problems in statistics.
Calculate the test statistic from sample information
Find the p-value from the test statistic
