ISDM5Q

Chapter-8 Questions

Show your work and explain your results to answer each question. Don’t write just a number.

1. Use a random number table to draw a random sample with N = 8 from the following scores. 21, 31, 17, 13, 02, 09, 57, 26, 72, 140, 27, 27, 27, 21, 13, 57, 43, 22, 18, 19, 18, 18, 18, 23, 25, 66, 75, 89, 99, 112.

2. Calculate the standard error of the mean for a sample of 8 for the population in Problem #1. The 

 = 1205 and 

https://exploringstatistics.com/images/studyguide/x_sumX2.png

 = 82091

3. A teacher was interested in the mathematical ability of graduating high school seniors in her state. She gave a 32-item test to a random sample of 75 seniors from her state with the following results: The 

 = 1275 and 

https://exploringstatistics.com/images/studyguide/x_sumX2.png

= 23525. Establish a 95% confidence interval about the mean, and write a sentence that explains the interval you found to a high school principal.