PSY 230 Mid-term PII Exam
Question # 00044027
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Updated on: 01/26/2015 05:50 AM Due on: 01/26/2015
1).Randomly pick three blocks of five numbers and write them down.
2).What sampling method did you just use? Describe the rationale for your answer in a paragraph
of text.
3).What is the probability that the next student taking the test would happen to select the same
three blocks of random numbers that you selected in number 1 above? Show your work so your
instructor can provide feedback.
4).Write down the last two digits of each of the 15 numbers selected in number 1 above. Present
these numbers in an ordered stem and leaf plot.
5).Using the data from number 4 above, construct a frequency distribution with an appropriate
number of classes. Summarize the frequency distribution by presenting it in columns with
headings. Include headings for Class, Frequency, Midpoint, Relative Frequency, and Cumulative
Frequency.
6).Describe the distribution created by the data in number 4 and 5 above in terms of its shape,
modality, skewness, etc., using appropriate statistical terminology
7).Calculate the mean, variance and standard deviation of the distribution of scores listed in
number 4 above. Show your work so your instructor can provide feedback.
8).Calculate the 50th percentile of the distribution in number 4 above. What score is at the 50th
percentile? Be sure to show your work.
9).Based on what you know about the distribution above, what would be the probability of
selecting a score at random that corresponds to a z-score of at least 1.4?
2).What sampling method did you just use? Describe the rationale for your answer in a paragraph
of text.
3).What is the probability that the next student taking the test would happen to select the same
three blocks of random numbers that you selected in number 1 above? Show your work so your
instructor can provide feedback.
4).Write down the last two digits of each of the 15 numbers selected in number 1 above. Present
these numbers in an ordered stem and leaf plot.
5).Using the data from number 4 above, construct a frequency distribution with an appropriate
number of classes. Summarize the frequency distribution by presenting it in columns with
headings. Include headings for Class, Frequency, Midpoint, Relative Frequency, and Cumulative
Frequency.
6).Describe the distribution created by the data in number 4 and 5 above in terms of its shape,
modality, skewness, etc., using appropriate statistical terminology
7).Calculate the mean, variance and standard deviation of the distribution of scores listed in
number 4 above. Show your work so your instructor can provide feedback.
8).Calculate the 50th percentile of the distribution in number 4 above. What score is at the 50th
percentile? Be sure to show your work.
9).Based on what you know about the distribution above, what would be the probability of
selecting a score at random that corresponds to a z-score of at least 1.4?
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Solution: PSY 230 Mid-term PII Exam Solution