« previous next »

Author Question: Which of the following is an unbiased estimator for the corresponding parameter? a.The ... (Read 36 times)

fasfsadfdsfa

  • Hero Member
  • *****
  • Posts: 554
on: Jun 24, 2018

  Which of the following is an unbiased estimator for the corresponding parameter?
 

  a.The population standard deviation is an unbiased estimator for the sample standard deviation s.
  b.The sample mean is an unbiased estimator for the population mean .
  c.The population proportion is an unbiased estimator for the sample proportion.
  d.The population variance is an unbiased estimator for the sample variance s2.

Question 2


  Suppose the income of recent doctoral graduates who become professors at a university is approximately normally distributed with a mean income of 42,000 and a standard deviation of 8000. If a random sample of size 100 is taken and the mean is calculated, what is the probability that this mean value will be between 43,500 and 45,000?
 

  a.0.072
  b.0.0309
  c.0.9999
  d.0.969


deja

  • Sr. Member
  • ****
  • Posts: 332
Reply #1 on: Jun 24, 2018
Answer to Question 1

correct: b

Answer to Question 2

correct: b


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Did you know?

Many supplement containers do not even contain what their labels say. There are many documented reports of products containing much less, or more, that what is listed on their labels. They may also contain undisclosed prescription drugs and even contaminants.

Did you know?

If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.

Did you know?

Stevens-Johnson syndrome and Toxic Epidermal Necrolysis syndrome are life-threatening reactions that can result in death. Complications include permanent blindness, dry-eye syndrome, lung damage, photophobia, asthma, chronic obstructive pulmonary disease, permanent loss of nail beds, scarring of mucous membranes, arthritis, and chronic fatigue syndrome. Many patients' pores scar shut, causing them to retain heat.

Did you know?

Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.

Video: Exercise and cardiac output

For a complete list of videos, visit our video library