« previous next »

Author Question: A researcher determined the size sample necessary to estimate two population means Y and Z. The ... (Read 43 times)

V@ndy87

  • Hero Member
  • *****
  • Posts: 571
on: Jun 29, 2018
A researcher determined the size sample necessary to estimate two population means Y and Z. The indicated sizes were 200 to estimate Y and 300 to estimate Z with the specified degrees of confidence and precision. The researcher decided therefore to use a sample of size 250 . Assuming the estimates of the population standard deviation were correct
 a. the estimate of Y is more precise than desired while that for Z is less precise than desired.
  b. the estimate of Y is less precise than desired while that for Z is more precise than desired.
  c. Y is estimated with exactly the specified degree of precision while Z is estimated less precisely than desired.
  d. Z is estimated with exactly the specified degree of precision while Y is estimated less precisely than desired.
  e. Both Y and Z are estimated with the exact specified degree of precision.

Question 2

If the sample standard deviation turns out to be larger than the estimated population standard deviation, the confidence interval to estimate a population mean will be __________ planned.
 a. Narrower than
  b. Wider than
  c. The same as
  d. As precise as
  e. None of the above


ndhahbi

  • Sr. Member
  • ****
  • Posts: 390
Reply #1 on: Jun 29, 2018
Answer to Question 1

a

Answer to Question 2

b


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

About 60% of newborn infants in the United States are jaundiced; that is, they look yellow. Kernicterus is a form of brain damage caused by excessive jaundice. When babies begin to be affected by excessive jaundice and begin to have brain damage, they become excessively lethargic.

Did you know?

Individuals are never “cured” of addictions. Instead, they learn how to manage their disease to lead healthy, balanced lives.

Did you know?

Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

Did you know?

The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.

Detritivores are often classified according to their body size as microflora, microfauna, mesofauna, Detritivores are often classified according to their body size as microflora, microfauna, mesofauna,
The small-scale distribution of different tree species in a Douglas-fir forest is determined by both The small-scale distribution of different tree species in a Douglas-fir forest is determined by both
Superior view of heart valves illustrating position, size, and shape of each valve. Superior view of heart valves illustrating position, size, and shape of each valve.
Sample Items from the Brief Multidimensional Measure of Religiousness/Spirituality (BMMRS) Sample Items from the Brief Multidimensional Measure of Religiousness/Spirituality (BMMRS)
Population and Settlement Population and Settlement
The Size Of Your Baby’s Stomach The Size Of Your Baby’s Stomach
Video: Interpreting a cladogram Animation

For a complete list of videos, visit our video library