Friday, April 24, 2009

April 25, 2009 - Chapter 7 Group Questions, quick multiple choice

1. A probability distribution curve is always bell-shaped and symmetric about the mean.
a) True
b) False

2. A z-score indicates a position of probability value under the normal curve.
a) True
b) False

3. The cumulative area for z = 0 is 0.5000.
a) True
b) False

4. Which of the following describes the properties of a normal distribution?
a) Mean, median, and mode are equal.
b) The normal curve is bell-shaped.
c) The normal curve is symmetric about the mean.
d) The normal curve touches the x-axis.

5. For any population distribution and any sample size n, the mean of the sampling
distribution of sample means is equal to the population mean.
a) True
b) False

6. According to the Central Limit Theorem, as the sample size increases, n ≥ 30, the
sampling distribution of sample means gets closer to a normal distribution.
a) True
b) False

7. The area under the standard normal curve between z = 0 and z = 3 is:
a) 0.0010
b) 0.4987
c) 0.9987
d) 1.0000

8. One of the properties of sampling distributions of sample means states that the mean of
the sample means, μ x is equal to the population mean.
a) True
b) False

9. The standard deviation of the sampling distribution of the sample means is called:
a) Standard error of the mean
b) Margin of error
c) Sampling error
d) Standard error of the median

23 comments:

  1. Posted By: Bryan S., Sheila W., Karolyn M., Nick N.

    1) False
    2) True
    3) True
    4) A,B,C
    5) F
    6) True
    7) C
    8) True
    9) A

    ReplyDelete
  2. 1. False
    2. True
    4. A, B, and C
    5. False
    6. True
    7. C
    8. True
    9. A

    ReplyDelete
  3. Justin Kirchmeier
    Jace Wheeler
    Alex Reyes

    1. False
    2. False
    3. True
    4. A B C
    5. False
    6. True
    7. B
    8.True
    9. A

    ReplyDelete
  4. Evan, Rick, John, Mel
    1. A probability distribution curve is always bell-shaped and symmetric about the mean.
    b) False *

    2. A z-score indicates a position of probability value under the normal curve.
    b) False *

    3. The cumulative area for z = 0 is 0.5000.
    a) True*

    4. Which of the following describes the properties of a normal distribution?
    a) Mean, median, and mode are equal. *
    b) The normal curve is bell-shaped. *
    c) The normal curve is symmetric about the mean. *

    5. For any population distribution and any sample size n, the mean of the sampling
    distribution of sample means is equal to the population mean.
    b) False*

    6. According to the Central Limit Theorem, as the sample size increases, n ≥ 30, the
    sampling distribution of sample means gets closer to a normal distribution.
    a) True *

    7. The area under the standard normal curve between z = 0 and z = 3 is:
    c) 0.9987 *

    8. One of the properties of sampling distributions of sample means states that the mean of
    the sample means, μ x is equal to the population mean.
    a) True *

    9. The standard deviation of the sampling distribution of the sample means is called:
    a) Standard error of the mean *
    b) Margin of error *

    ReplyDelete
  5. Rick O'Neil
    Tonya Cox

    1. F
    2. F
    3. T
    4. A, B, C
    5. F
    6. T
    7. B
    8. T
    9. A

    ReplyDelete
  6. Answers:

    1. F
    2. F
    3. T
    4. Mean, medium, mode, equal, et al
    5. F
    6. T
    7. .4987
    8. T
    9. Standard Error
    10. (D)

    ReplyDelete
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