Self-Paced Calculator Practice for Stats.pdf

Practice 7 bottles of soda from a factory are filled

Info icon This preview shows pages 12–18. Sign up to view the full content.

View Full Document Right Arrow Icon
Practice 7: Bottles of soda from a factory are filled to a mean of 12.1 oz with a standard deviation of .1 oz. What is the probability that a random bottle will be filled with between 12 and 12.5 oz of soda? What is the chance it will be less than 12 oz? Hint: for the second part, use a very negative number as the bottom of the range. Inverse Normal Distribution Using the inverse normal distribution works the same as the normal distribution but in reverse. For example, the normal distribution can tell you what proportion of men are shorter than 55 inches. The inverse can tell you the height that 90% of men are shorter than. Assume as above that the average height is 60 and the
Image of page 12

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
standard deviation is 4. Use 2ND, DISTR, and then select 3:invNorm(. Fill in .9,60,4). 90% of men would be shorter than 65 inches according to our assumed mean and standard deviation. Practice 8: Assume a mean of 60 and a standard deviation of 4. What height are only 10% of men shorter than? Tests and Intervals Statistical tests and confidence intervals are located in the same menu. Push the STAT button and then move right to the TESTS section. A statistical test will allow you to verify the truth of a claim. A confidence interval is an estimate of a value. Most problems that require an interval will specifically use that word in the question. Choose Z-Test from the menu.
Image of page 13
Tests have a choice of ‘Data’ or ‘Stats’. Pick data if you are going to enter numbers into a STAT, 1:Edit column. Choose stats if you are going to enter summary statistics from the problem. Select stats now. Enter mean and standard deviation on the next two lines. For this example, enter 50 and 10. Next, x-bar will be 45, and n is 22. Finally, choose < from the options at the bottom. Highlight ‘Calculate’ and press ENTER. The p value tells you the probability that the sample might occur assuming the true mean is 50. You will learn much more about this in class, but it is helpful to become familiar with entering this information into the calculator. Next, go to STAT, TESTS, 7:ZInterval. The numbers you entered during the last example will already be present. Select calculate.
Image of page 14

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
There is a 95% confidence that the true value is between 40.8 and 49.2. Try out some other options on the STAT, TESTS menu. They work in a similar way. Additional Resources There are many helpful videos and other examples available. The addresses below will allow you to practice further. http://media.pearsoncmg.com/aw/aw_mml_shared_1/statistics/TechnologyTuto rial/studycard_gc_videolaunch.html http://media.pearsoncmg.com/aw/aw_agresti_as_learning_data_3/tech_manual s/gcm/ast3e_gcm_manual.html http://media.pearsoncmg.com/aw/aw_mml_shared_1/gc_tutorial_stats/start.ht ml
Image of page 15
Answers to Practice Questions Practice 1) Practice 2) Practice 3)
Image of page 16

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Practice 4) Practice 5) Practice 6)
Image of page 17
Practice 7) Practice 8)
Image of page 18
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern