OMGT6123 QUIZ#4 - REVIEW SHEET

This is a review & information sheet for Quiz #4 OMGT6123. 

This quiz is administered via Canvas & consists of 15 question multiple choice questions.  It is timed at 25 minutes maximum.  You will have one attempt to complete the quiz.  The quiz will become available on November 1st & then will close on November 2nd at 11:59 pm.  Take note of this window of opportunity to complete the quiz.

You are on your HONOR to complete this assignment without assistance from other students, outside websites, outside AI programs, or other internal or external entities.

Topics you can expect to see on the quiz:

1.      How to determine sample size when given sampling error, sample standard deviation, & a level of confidence

2.      Be able to calculate a z stat for a given set of data (e.g., population mean, sample mean, sample standard deviation, & sample size)

3.      Know how to interpret that z stat compared to the hypothesis/claim being made (i.e., be able to compare the z stat to the z crit & conclude what the result is)

4.      If given a confidence interval be able to calculate sampling error.

5.      What happens in regard to a test statistic (e.g., z stat) when the confidence value changes.




Here are some sample problems to study & think about for Quiz #4.  Take note of how much time it takes you to read the problem, decipher the info included, & then how long it takes to formulate an answer.



When calculating a z stat, keeping all other variables constant while increasing the confidence level from 95% to 99% results in a _____ test statistic.

 

 

 

Jordan wants to estimate the average weekly study time for a specific group of university students. Based on a prior pilot study, the standard deviation is assumed to be 4 hours. If Jordan wants a 95% confidence interval z-value = 1.96) with a sampling error of 0.5 hours, what is the minimum sample size required?

 

 


A research team at a biomedical lab has been working with local clinics to test a new automated insulin pump. The device's dosage delivery must average mu = 5.0 milligrams (mg) per hour to be considered calibrated. Recently, the team conducted delivery tests on a specific unit. Based on a sample of 45 automated delivery readings (taken at random intervals), the dosage delivered averaged xbar = 5.12 mg, with a sample standard deviation of s = 0.35 mg. To determine whether the device meets the calibration requirements, consider the test Ho: mu = 5.0 vs. Ha: mu does not = 5.0, Where mu is the true mean dosage delivery with 95% confidence (z-value = 1.96). What is the test statistic?




Elena is trying to estimate the average time it takes graphic design students to complete a digital portfolio project. She wants the sampling error to be within 1.5 hours at a 95% confidence level (z-value = 1.96). Based on a pilot study, the sample standard deviation of the times is estimated to be 6 hours. How large of a sample should be taken to get the desired interval?