Logo
Home Study Material Contact Search
AI Chat FREE
  1. mathematics
  2. statistics
  3. 1. suppose we wish to find the required sample siz

1. Suppose we wish to find the required sample size to find a 90% confidence interval...

50.1K

Verified Solution

Question

Statistics

1. Suppose we wish to find the required sample size to find a90% confidence interval for the population proportion with thedesired margin of error. If there is no roughestimate   of the population proportion, what valueshould be assumed for  ?

0.90

0.10

0.50

0.05

2. An analyst takes a random sample of 25 firms in thetelecommunications industry and constructs a confidence intervalfor the mean return for the prior year. Holding all else constant,if he increased the sample size to 30 firms, how are the standarderror of the mean and the width of the confidence intervalaffected?

Standard error of the meanWidth of confidence interval
AIncreasesBecomes wider
BIncreasesBecomes narrower
CDecreasesBecomes wider
DDecreasesBecomes narrower

1.96(10.24/6)

1.96(3.20/6)

1.645(3.20/6)

1.645(10.24/6)

3. For a given confidence level and population standarddeviation, which of the following is true in the intervalestimation of the population mean?

If the sample size is bigger, the interval is narrower.

If the population size is smaller, the interval is narrower.

If the population size is bigger, the interval is narrower.

If the sample size is smaller, the interval is narrower.

Answer & Explanation Solved by verified expert
4.1 Ratings (834 Votes)
1 The margin of error ME critical valuewhere is the sample proportion n is the sample size ie number ofsamples under considerationIf the value of is not given we assume it to be 052 The confidence interval for the mean of a population    See Answer
Get Answers to Unlimited Questions

Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!

Membership Benefits:
  • Unlimited Question Access with detailed Answers
  • Zin AI - 3 Million Words
  • 10 Dall-E 3 Images
  • 20 Plot Generations
  • Conversation with Dialogue Memory
  • No Ads, Ever!
  • Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!
Become a Member

Other questions asked by students

Q

What are the three categorization for intangible assets andamortized or impaired (provide examples)?What are...

Accounting
Q

Nitrous oxide (N2O) is also known as “laughing gas”. Write all of the resonance structures for...

Chemistry
Q

Use a graphing utility to graph the polynomial function defined by the left side of...

Algebra
Q

Ibrahima Duncan was debating the merits of a new product. Currently, the budgeted...

Accounting
Q

Petrini Corporation makes one product and it provided the following information to help prepare the...

Accounting
Q

3. Explain when and why the users of financial statements are not able to detect...

Accounting
Q

Which word properly completes each of the following statements? Decreasing the risk of assessing control...

Accounting
Q

Poor segregation of duties can most likely lead to Will not have any impact...

Accounting
Q

A1A is a proprietorship that has a calendar fiscal year. The proprietorship begins operations on...

Accounting
Q

5. Kullanm fiyat 25$ olan XYZ hissesi zerinde on sat opsiyonu szlemesine sahipsiniz. XYZ hissesi...

Finance
Q

Which of the following is FALSE? A debenture is a bond that has no collateral....

Finance
Q

Please help me solve this ...

Accounting