This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Many textbooks (though not this one) advocate testing the mean of a sample against a hypothesized ... (Read 44 times)

crazycityslicker

  • Hero Member
  • *****
  • Posts: 537
on: Jun 20, 2018
Many textbooks (though not this one) advocate testing the mean of a sample against a hypothesized population mean by using z even if the population standard deviation is not known, so long as the sample size exceeds 30. Those books recommend this because
 
  a. they don't know any better.
  b. there are not tables for t for more than 30 degrees of freedom.
  c. the difference between t and z is small for that many cases.
  d. t and z are exactly the same for that many cases.

Question 2

If the standard deviation of the population is 15 and we repeatedly draw samples of 25 observations each, the resulting sample means will have a standard error of
 
  a. 2
  b. 3
  c. 15
  d. 0.60


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

fromAlphatoOmega22

  • Sr. Member
  • ****
  • Posts: 345
Reply #1 on: Jun 20, 2018
Answer to Question 1

C

Answer to Question 2

B


crazycityslicker

  • Member
  • Posts: 537
Reply 2 on: Jun 20, 2018
Excellent

Dnite

  • Member
  • Posts: 297
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Did you know?

The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Sample Exercise Program for Limited Older Adults (cont.) Sample Exercise Program for Limited Older Adults (cont.)
ABO and Rh grouping using gelatin centrifugation. The blood sample above is AB negative as indicated ... ABO and Rh grouping using gelatin centrifugation. The blood sample above is AB negative as indicated ...
Testing motor function of cranial nerve VII - Close both eyes Testing motor function of cranial nerve VII - Close both eyes
Testing motor function of cranial nerve VII - Puff cheeks Testing motor function of cranial nerve VII - Puff cheeks
Testing the client’s ability to feel vibrations, the toe Testing the client’s ability to feel vibrations, the toe
Testing patellar reflex with distraction Testing patellar reflex with distraction
Video: Types of antimicrobial substances (interferons & complement protein)

For a complete list of videos, visit our video library