School

Georgia Southern University **We aren't endorsed by this school

Course

ITEC 7430

Subject

Statistics

Date

Sep 25, 2023

Type

Other

Pages

4

Uploaded by Professor_Internet_Jaguar14 on coursehero.com

Desiree T. Hinton
EDUR 8131: Test 1
Due: 2/15/2021
Instructions: Submit test responses as a PDF attachment in Folio Dropbox. Dropbox submission
instructions:
1. Describe the following terms as simply as possible in your own words (do not explain how they are
used, rather
explain the concept each represents; 1 point each, 3 points total):
a.
The mean subtracted from a raw score
b.
Incorrectly rejecting a true null
2. Write a directional hypothesis for the following variables: IV is presence of a high-powered subwoofer
in one's car (present vs. not present) and the DV is level of hearing loss as measured in decibels (dB HL;
which ranges from a low of 0 dB to a severe level of 91 or more). This must be a written hypothesis, not
symbolic hypothesis (e.g., do not present the hypothesis in the form of Ho: µ1 = µ2). (2 points)
3. Identify each of the following as either qualitative or quantitative variables (1 point each; 3 points
total):
a. One's decision to buy a car, truck, or van
b. Number of shots made at the free-throw line in basketball when attempting 20 shots
c. Type of credit card (e.g., Visa, Mastercard, Discover Card, American Express, etc.)
4. Indicate whether the following are nominal, ordinal, interval, or ratio variables (1 point each; 4 points
total):
a. Whether one has a master's degree (yes vs. no)
b. Number of shots made at the free-throw line in basketball when attempting 20 shots
ratio
c. Kindergartner's family composition (mother-father, mother only, father only, etc.)
nominal
d. Percentage of votes received by a candidate
5. Below are my heart rate readings recorded shortly after rising each morning for two weeks:
52, 51, 47, 42, 46, 46, 46, 50, 49, 52, 67, 50, 45, 46
For these data, present the following information (while you may use SPSS or other software to calculate
the following, do not copy and paste SPSS or other software output except for i and j; instead report
results you obtained by the letter identification below so I can quickly locate your response; 1 point each
except for i and j which are worth 2 points each; 12 points total):
(a) Mean
49.214

(b) Median
48
(c) Mode
46
(d) Variance
34.77
(e) Standard Deviation
5.899
(f) Range
25
(g) What is the percentile rank for a pulse of 46 for these data?
(h) What is the z score for a pulse of 42?
(i) Ungrouped frequency display (include frequency, relative frequency, and cumulative relative
frequency)
(j) Stem-and-leaf display
6. I am planning a backpacking trip to Glacier National Park in Montana. Below are graphical displays
showing average temperatures (both average high and low) for each month and average precipitation for
each month in West Glacier, MT. (4 points)
(a) Which month would provide the warmest temperature, on average, in West Glacier?
(b) Which month would provide the coldest temperature, on average, in West Glacier?
(c) Which would be the driest month, on average, in West Glacier?
(d) Which would be the wettest month, on average, in West Glacier?
The figures follow on the next page.
Sourcehttp://www.weather.com/weather/wxclimatology/monthly/graph/USMT0352
(Figure 9a) Average Monthly Temperature in West Glacier, MT.
01/14/2021 4
(Figure 9b) Average Monthly Percipitation in West Glacier, MT.
7. Quotation:
"...a large-scale 2013 study in the Journal of the National Cancer Institute which found "no
statistically
significant relationship between lung cancer and exposure to passive smoke."
Source:
http://www.foxnews.com/politics/2014/04/09/climate-change-fiercely-debated-with-widely-
divergent-facts/

What type of error, if any, could have been made in hypothesis testing for this study? If an error could be
made, what is the probability of this error (i.e., alpha, beta, 1-alpha, 1-beta, or something else)? (2
points)
8. Quotation:
"Sean Trende at RealClearPolitics wrote in January that there is a statistically significant
relationship between Obama's job approval and Democratic votes in Senate elections."
Source: http://rt.com/usa/155720-obama-approval-lowest-of-term/
What type of error, if any, could have been made in hypothesis testing for this study? If an error could be
made, what is the probability of this error (i.e., alpha, beta, 1-alpha, 1-beta, or something else)? (2
points)
9. Across the nation students take GRE tests for admission decisions at graduate schools. Usually these
tests consist of three sub-tests (verbal, quantitative, logical), and each sub-test typically has an overall
mean of 500 and standard deviation of 100. Additionally, the distribution of scores for each sub-test is
often closely approximated by the normal curve. Answer the following questions for the verbal portion
of the GRE. (1 point each; 2 points total).
(a) What percentage of students will score 339 or better on the verbal portion of the GRE?
(b) What is the percentile rank for a student with a score of 518?
10. Assume the mean score on this EDUR 8131 test is 85.71 with a SD of 6.81. Find the raw score for a
student who has a Z score of (1 point each; 3 points total):
(a) 1.35
(b) -1.95
(c) 0.00
11. According to the National Health and Nutrition Examination Survey and the Epidemiologic Follow-up
Study the mean systolic blood pressure for individuals aged 25 to 59 is 127.3 with a standard deviation of
20.2. A sample measurement of systolic blood pressure from 15 EDUR 8131 Statistics students is taken to
learn whether EDUR 8131 students have blood pressure that differs from the national average.
(a) Perform a one sample Z test on these data to learn whether a difference in blood pressure exists
• present calculated Z test value;
• write a brief conclusion about your finding (4 points).
(b) Construct a 95% confidence interval about the sample mean for these data (2 points).
Sample Systolic Blood Pressure
133 156 101
145 119 137
105 146 132
109 164 163