This topic contains a solution. Click here to go to the answer

Author Question: Why is it that when we find the sample standard deviation, we divide by n-1 but when we find the ... (Read 130 times)

melina_rosy

  • Hero Member
  • *****
  • Posts: 531
Why is it that when we find the sample standard deviation, we divide by n-1 but when we find the population standard deviation we divide by n?
 
  What will be an ideal response?

Question 2

An emergency room in a hospital wants to determine the sample size needed for estimating their mean number of visits per day. If they want a 99 percent confidence level the correct critical value to use is 2.33.
 
  Indicate whether the statement is true or false



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Jsherida

  • Sr. Member
  • ****
  • Posts: 314
Answer to Question 1

The technical answer to this question is beyond the scope of the text. However, we can think of it this way. If our objective in computing the sample standard deviation is to estimate the population standard deviation, we would want an estimate that would be correct on the average. That means that if we took repeated random samples from the population and for each sample we computed the standard deviation, we would want the average of the sample standard deviations to equal the population standard deviation. If our formula for the sample standard deviation uses n-1, this occurs.

Answer to Question 2

FALSE




melina_rosy

  • Member
  • Posts: 531
Reply 2 on: Jun 24, 2018
YES! Correct, THANKS for helping me on my review


vickybb89

  • Member
  • Posts: 347
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

Did you know?

Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.

Did you know?

All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.

Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

Did you know?

An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

Did you know?

Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

For a complete list of videos, visit our video library