Author: Anonymous

The results of a hypothesis test are reported as follows in a scientific report: t (150)= 8.75, p < .05.  Based on this information, which statement below is NOT correct?

Health researchers conduct a study comparing major depressive disorder rates in high school students to the nationwide average of 10. Researchers select a sample of 10 students who have a mean score of 17 (S= 10). Calculate the t statistic (round to 2 decimal places)

A one sample z test is testing to see if there is a significant difference between a single sample mean and a _____________?

One sample has M = 30 and a second sample has M = 15. If the pooled variance for the two samples is s2p = 50, what is the value of Cohen’s d?  (round to 2 decimal places)

What is the z score for an X score of 9 with a population mean of µ = 15 and σ = 4?

A research study uses n = 50 participants in one group and n = 45 participants in a second group to compare two treatment conditions. What is the df value for the t statistic computed for the corresponding hypothesis test? ___________________

MCAT scores are approximately normally distributed with a population mean score of 500 ± 10 (µ±σ). Kaplan takes a random sample of 100 students who completed their MCAT preparation scores and found a sample average of 503. What is the probability of selecting a sample mean of 503 or larger from this population? (include 4 decimal places)

According the American Academy of Physician Assistants (AAPA) reported that the mean annual salary for physician assistants was approximately $110,000 in 2021 (σ= 6,000). The researcher randomly selects 50 PAs in Texas and finds their average salary is $108,000. If the researcher conducts a non-directional, one-sample z test what are the correct hypotheses?

A researcher examined attendance in group exercise vs. individual strength-training program. He randomly assigned participants to a program and found out that the average number of sessions attended in group exercise was 6, while the number of sessions attended in strength-training  was 3. Use the results of a 95% CI below to determine whether these two programs significantly differ in terms of attendance.  The researchers should make the decision to ____________ the null hypothesis and conclude that the _________exercise program showed significantly better attendance.    

How is one sample t test different from the two independent sample t test?