QCEVault

Interval estimates for proportions — Question 146

Original QCE Vault practice · 1 mark

Q146 · Practice questionTechnology-freeSimple familiar1 mark

QUESTION 146

An approximate confidence interval for a population proportion is (0.41,0.49)(0.41,0.49). The margin of error is
(A)
0.040.04
(B)
0.080.08
(C)
0.410.41
(D)
0.450.45
Question linkSyllabus coverage

Related questions

  1. Q10 · Original practice · 1 mark
    A sample has p^=0.40\hat p=0.40 and n=100n=100. Using z=1.96z=1.96, the approximate margin of error for a 95% confidence interval is
    Interval estimates for proportions
  2. Q20 · Original practice · 1 mark
    A sample of 625 gives p^=0.52\hat p=0.52. A 95% confidence interval using z=1.96z=1.96 is closest to
    Interval estimates for proportions
  3. Q35 · Original practice · 3 marks
    A random sample of 400 gives p^=0.48\hat p=0.48. Using z=1.96z=1.96, determine an approximate 95% confidence interval for the population proportion.
    Interval estimates for proportions
  4. Q45 · Original practice · 4 marks
    A pilot study estimates a population proportion as 0.370.37. Determine the minimum sample size required so that an approximate 95% confidence interval has margin of error at most 0.030.03, using the pilot estimate in the calculation.
    Interval estimates for proportions