Question 1

  1. Assume that a sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. Round the margin of error to four decimal places. 98% confidence; the sample size is 800, of which 40% are successes

    A.

    0.0339

    B.

    0.0446

    C.

    0.0403

    D.

    0.0355

1 points  

Question 2

  1. Find the value of that corresponds to a confidence level of 91%.

    A.

    1.75

    B.

    1.34

    C.

    1.645

    D.

    1.70

1 points  

Question 3

  1. Find the appropriate critical value for the following:  99% confidence level ; n = 17; σ is unknown; population appears to be normally distributed.

    A.

    zα/2 = 2.567

    B.

    zα/2 = 2.583

    C.

    tα/2 = 2.898

    D.

    tα/2 = 2.921

2 points  

Question 4

  1. Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. n = 195, x = 162; 95% confidence

    A.

    0.788 < p < 0.873

    B.

    0.777 < p < 0.884

    C.

    0.789 < p < 0.873

    D.

    0.778 < p < 0.883

1 points  

Question 5

  1. Thirty randomly selected students took the calculus final. If the sample mean was 95 and the standard deviation was 6.6, construct a 99% confidence interval for the mean score of all students.

    A.

    92.03 < μ < 97.97

    B.

    92.95 < μ < 97.05

    C.

    91.68 < μ < 98.32

    D.

    91.69 < μ < 98.31

1 points  

Question 6

  1. 50 people are selected randomly from a certain population and it is found that 12 people in the sample are over 6 feet tall. What is the point estimate of the proportion of people in the population who are over 6 feet tall?

    A.

    0.18

    B.

    0.76

    C.

    0.24

    D.

    0.50

2 points  

Question 7

  1. Use the given data to find the minimum sample size required to estimate the population proportion. Margin of error: 0.028; confidence level: 99%; and unknown

    A.

    2223

    B.

    2115

    C.

    1116

    D.

    1939

Leave a Reply

Your email address will not be published. Required fields are marked *