Ww2.justanswer.com
1.
A poll of registered voters in Florida asking which candidate they support: NOMINAL
The length of time required for a wound to heal when using a new medicine: RATIO
The number of telephone calls arriving at a switchboard per five-minute period: RATIO
The distance first-year college football players can kick a ball: RATIO
Mental health diagnoses present in an elderly population: NOMINAL
The rankings of employees on their job performance: ORDINAL
2. (5 * 2)/200 = 10/200 = 5%
3.
z = (x - mu)/sigma
z = (45 - 38)/3
z = 7/3
z = 2.33
Using Excel NORMSDIST, p = 0.9902
That means that 99% of students will be able to complete the work in the time she has left.
4.
variance
a) Mean = (7 + -12 + 4 + -7 + 3 + -10) / 6 = -2.5
b) Median = average of two middle datapoints = (-7 + 3)/2 = -2
c) Mode: none
d)
s = sqrt [ Σ (x - xbar)^2 / (n-1)]
s = sqrt[( (7--2.5)^2 + (-12--2.5)^2 + (4--2.5)^2 + (-7--2.5)^2 + (3
--2.5)^2 + (-10--2.5)^2 )/5]
s = sqrt[( 9.5^2 + -9.5^2 + 6.5^2 + -4.5^2 + 5.5^2 + -7.5^2 )/5]
s = sqrt[( 90.25 + 90.25 + 42.25 + 20.25 + 30.25 + 56.25) /5]
s = sqrt (329.5/5)
s = sqrt (65.9)
s = 8.1179
e) Range = max - min = 7 - -12 = 19
f) Variance: from calculations in d) above, s^2 = 65.9
5.
Chemistry:
z = (x - mu)/sigma
z = (81 - 70)/20
z = 11/20
z = 0.55
Using Excel NORMSDIST, p = 0.7088
History:
z = (x - mu)/sigma
z = (75 - 65)/8
z = 10/8
z = 1.25
Using Excel NORMSDIST, p = 0.8944
The student did better in history. She scored 1.25 SD above the mean, which is better than 89% of the students. In Chemistry, the student scored 0.55 SD above the mean, which is better than 71% of the
students.
6. Convenience sampling. It doesn't give a random sample, so it's not possible to make inferences about the results in the population as a whole. The students you ask likely don't include some important subgroups.
7. Nominal variables
8. A testable hypothesis
9. The null hypothesis
10. 7.8
11. 8
12. 7
13. 5
14. 2.56
15. The curve extends to + and – 3 standard deviations from the mean
16. 68
17. Degrees of freedom
18. Rejecting the null hypothesis when in reality the null hypothesis is true
19. convenience sampling
20. number of subjects
21. all of the above are true
22. Boys who play sports are not viewed as more attractive than boys who do not play sports
23. Rejected at the .05 level
24. 20
25. If each participant is measured twice
26.
In my opinion, none of these answers is correct.
95% falls within 2 sd of the mean
68% falls within 1 sd of the mean.
95% - 68% = 27%, which is the correct answer.
It’s possible that the question means, “within either 1 or 2 sd of the mean”. The answer to that would be 95%.
27. Mean
28. Frequencies
29. Standard deviation
30. 68% of 300 = 204
31. Mean
32. z scores
33. Range
34. Mode
35. 0.45 + 0.35 – 0.25 = 0.55
36. The new mean distance is less than 8.2 miles.
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