Stats Exam 3 Question and answers
correctly solved 2025/2026
When would it be appropriate for a two-way ANOVA test? - correct answer ✔When you want to apply
more than one factor.
What were the differences between Tukey's HSD method compared to Fisher's LSD method? - correct
answer ✔Fishers uses T-score and does not account for inflated type 1 error and the Turkeys model
does
When do you reject a one or two way null ANOVA hypothesis? - correct answer ✔When p-value is less
than alpha
With ANOVA testing what is a Type 1 Error and what is a Type 2 Error? - correct answer ✔Type 1: reject
the null hypothesis when it is true
Type 2: do not reject the null hypothesis when it is true
What is not a restriction when comparing 2 population means? - correct answer ✔Increasing your
sample size
When do you use the Z distribution when comparing 2 population means? - correct answer ✔When
standard deviation is known
(If we know the variances of the two populations o1, o2)
When do you pool the sample variances? - correct answer ✔When the standard deviation is unknown
but considered to be the same for the 2 groups
, It is generally believed that no more than 0.50 of all babies in a town in Oklahoma are born 2 weeks
early. A politician claims that the proportion of babies born 2 weeks early is increasing. Identify the
correct null and alternative hypotheses to test the politician's claim - correct answer ✔Null-P<=.5
Alt.- P>.5
one-tailed
When conducting a hypothesis test concerning the population mean, and the population standard
deviation is known, the formula for the test statistic is - correct answer ✔z=(x̄-μ0)/(σ(√n))
When would you use Fishers or Turkeys method to run a ANOVA test.
You would run it when the ________ hypothesis on a general one-way ANOVA was ________ - correct
answer ✔null, rejected
When performing AVOVA test you can perform a ______tail, a _____tail_, or a _______way. - correct
answer ✔right-tail, left-tail, two-way
What is the function in Excel that returns the sample correlation coefficient? - correct answer
✔=CORREL
Suppose you want to perform a test to compare the mean speed of all freshmen track runners with the
mean speed of all sophomores track runners in a college? What type of sampling is required for this
test?
______________ sampling with _______________ data - correct answer ✔Independent, numerical
When running Fishers ANOVA test how can you tell if a confidence interval is statistically significant or
not? - correct answer ✔If the confidence interval does NOT include zero its significant
Can you calculate a Z-score like on Exam 2? Below is a practice problem.
correctly solved 2025/2026
When would it be appropriate for a two-way ANOVA test? - correct answer ✔When you want to apply
more than one factor.
What were the differences between Tukey's HSD method compared to Fisher's LSD method? - correct
answer ✔Fishers uses T-score and does not account for inflated type 1 error and the Turkeys model
does
When do you reject a one or two way null ANOVA hypothesis? - correct answer ✔When p-value is less
than alpha
With ANOVA testing what is a Type 1 Error and what is a Type 2 Error? - correct answer ✔Type 1: reject
the null hypothesis when it is true
Type 2: do not reject the null hypothesis when it is true
What is not a restriction when comparing 2 population means? - correct answer ✔Increasing your
sample size
When do you use the Z distribution when comparing 2 population means? - correct answer ✔When
standard deviation is known
(If we know the variances of the two populations o1, o2)
When do you pool the sample variances? - correct answer ✔When the standard deviation is unknown
but considered to be the same for the 2 groups
, It is generally believed that no more than 0.50 of all babies in a town in Oklahoma are born 2 weeks
early. A politician claims that the proportion of babies born 2 weeks early is increasing. Identify the
correct null and alternative hypotheses to test the politician's claim - correct answer ✔Null-P<=.5
Alt.- P>.5
one-tailed
When conducting a hypothesis test concerning the population mean, and the population standard
deviation is known, the formula for the test statistic is - correct answer ✔z=(x̄-μ0)/(σ(√n))
When would you use Fishers or Turkeys method to run a ANOVA test.
You would run it when the ________ hypothesis on a general one-way ANOVA was ________ - correct
answer ✔null, rejected
When performing AVOVA test you can perform a ______tail, a _____tail_, or a _______way. - correct
answer ✔right-tail, left-tail, two-way
What is the function in Excel that returns the sample correlation coefficient? - correct answer
✔=CORREL
Suppose you want to perform a test to compare the mean speed of all freshmen track runners with the
mean speed of all sophomores track runners in a college? What type of sampling is required for this
test?
______________ sampling with _______________ data - correct answer ✔Independent, numerical
When running Fishers ANOVA test how can you tell if a confidence interval is statistically significant or
not? - correct answer ✔If the confidence interval does NOT include zero its significant
Can you calculate a Z-score like on Exam 2? Below is a practice problem.
