WorksheetsT test
Total questions: 10
Worksheet time: 5mins
What is the FIRST step in hypothesis testing?
Collect data
Set alpha level
State the null and alternative hypotheses
Compute test statistics
A researcher wants to test whether a sample mean differs from a known population mean. Which hypotheses are correct?
H0: μ₁ = μ₂ ; H1: μ₁ ≠ μ₂
H0: μ = value ; H1: μ ≠ value
H0: μ(d) = 0 ; H1: μ(d) ≠ 0
H0: μ ≠ value ; H1: μ = value
Which of the following best describes a paired-samples t-test?
Compares two independent groups
Compares one sample to a known value
Compares the same participants across two conditions
Compares more than two groups
A study compares stress levels between nurses working day shift and night shift. Which test is most appropriate
One-sample t-test
Paired-samples t-test
Independent-samples t-test
Correlation
What does the alpha level (α) represent?
Probability that the null hypothesis is true
Probability of making a Type I error
Probability of making a Type II error
The p-value of the test
If α = 0.05 and p = 0.03, what should the researcher do?
Fail to reject the null hypothesis
Accept the null hypothesis
Reject the null hypothesis
Increase sample size
A p-value of 0.02 means:
There is a 2% chance the null hypothesis is true
There is a 98% chance the alternative is true
If the null hypothesis is true, results this extreme or more extreme would occur 2% of the time
If the null hypothesis is true, results this extreme occur 2% of the time
A researcher measures participants before and after a treatment. Which design is this?
Between-subjects design
Correlational design
Within-subject design
Cross-sectional design
A study reports: t(30) = 2.10, p = 0.041, α = 0.05. What is the correct conclusion?
Fail to reject H0
Reject H0
Accept H0
Cannot determine
Why is a within-subject design often preferred?
It increases sample size
It reduces variability by comparing participants to themselves
It eliminates the need for hypothesis testing
It Increases variability by comparing participants to themselves
