(g) A random sample of 40 employees of a local company has been taken. A 97% confidence interval estimate for the mean age for all employees of the company is 23 to 54. Which of the following statements is valid? A. 97% of the sample of employees has an age between 23 and 54. B. If the sampling procedure were repeated many times, 97% of the resulting confidence intervals would contain the population mean age. C. 97% of the population of employees has an age between 23 and 54. D. If the sampling procedure were repeated many times, 97% of the sample means would be between 23 and 54. Answer:
(g) A random sample of 40 employees of a local company has been taken. A 97% confidence
interval estimate for the mean age for all employees of the company is 23 to 54. Which of the
following statements is valid?
A. 97% of the sample of employees has an age between 23 and 54.
B. If the sampling procedure were repeated many times, 97% of the resulting confidence intervals
would contain the population mean age.
C. 97% of the population of employees has an age between 23 and 54.
D. If the sampling procedure were repeated many times, 97% of the sample means would be
between 23 and 54.
Answer:
(h) A sample of 250 elements from a population with a known standard deviation is selected. For an
A.
B. t distribution with 250 degrees of freedom.
C. t distribution with 251 degrees of freedom.
D. t distribution with 249 degrees of freedom.
Answer:
(i) A random sample of 100 people was taken. Eighty of the people in the sample favored
Candidate A. Which of the following is (are) true?
A. the sampling distribution of p̅is normal
B. the sampling distribution of p is normal
C. the sampling distribution of p̅ is not normal
D. the sampling distribution of p is not normal
Answer:
(j) The average working hours in a week in Yangon was 40 hours before Covid 19 pandemic. It is
believed that the Covid 19 pandemic has led to a reduction in the average working hours in a
week. To test the validity of this belief, the hypotheses are
A. H0: μ < 40 Ha: μ ≥ 40.
B. H0: μ ≥ 40 Ha: μ < 40.
C. H0: μ > 40 Ha: μ ≤ 40.
D. H0: μ = 40 Ha: μ ≠ 40.
Answer:
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