SOLUTION: My final passing grade is depending on some of these problems. (I have tried working out them & I have including my work, if it is correct please let me know, if not please correct

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Question 664462: My final passing grade is depending on some of these problems. (I have tried working out them & I have including my work, if it is correct please let me know, if not please correct me, and if its blank, I need help!.)Please HELP!
Problem #1
(A) Classify the following as example of nominal, ordinal, interval, or ratio level of measurement, and state why it represents this level: distance between two signposts.
(B) Determine if this data is qualitative or quantitative: Brown eyes
(C) In your own line of work, give one example of a discrete and one example of a continuous random variable, and describe why each is continuous or discrete.(Points:9)
My answers: (A) Interval, measured along a scale in which each position is of equal distance from one another.
(B) qualitative-It is a variable that describes or categorizes an element of population.
(C) A discrete random variable is whether I get the flu or not, and how many days I stay home. This is a countable finite number. A continuous random variable is how many minutes after the hour it actually takes my school bus to get out of the parking lot.
Problem #2
A study is performed to discern if there is any difference in sitting heart rate between those who have two or less cups of coffee per day and those who have three or more cups per day. Subjects are chosen at random based on whether they drink two or less or three or more cups of coffee per day and their heart rates measured at the same time each day for a period of 3 months. Find the following:
I. What is the population?
II. What is the sample?
III. Is the study observational or experimental? Justify your answer.
IV. What are the variables?
V. For each of these variables, what level of measurement (nominal, ordinal, interval, or ratio) was used to obtain data from these variables?
(Points: 12)
Problem #3
Construct both an ungroup and a grouped frequency distribution for the data given below:
124 115 11 112 118 123 121 116 114 113
118 110 110 112 116 118 120 115 120 110
(Points: 10)
Problem #4
Given the following frequency distribution, find the mean, variance, and standard deviation. Please show your work.
Class …… Frequency
71-73 ….. 17
74-76 …. 8
77 –79… 12
80 – 82 .. 7
83 -85…16
(Points:10)
Problem #5
The following data lists the average monthly snowfall for January in 15 cities around the US:
42 45 8 18 45 15 31 46
3 33 2 6 32 47 36
Find the mean, variance, and standard deviation. Please show all of your work.
(Points:10)
My work: mean is a sum of sf/ sum of f
4221/63=67
SD: first calculate SSx
SSx=Sx^2f-[(Sxf)^2/n]
284103-(4221^2/63)
1296
S=sqrt(SSx/n-1)
S=sqrt(1296/(63-1)]
S=4.572
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 

Hi,

What I redid is Problem 4, differences most likely due to my getting "60" not "63"

Did not see any work for Problem 5.

Check out 4 and  5

Class …… Frequency

 71-73 ….. 17

 74-76 …. 8

 77 –79… 12

 80 – 82 .. 7

 83 -85…16

MidPT(M)	f	M*f	M - m	(M - m)^2	f(M - m)^2

	72	17	1224	-5.85	34.2225	           581.7825

	75	8	600	-2.85	8.1225	            64.98

	78	12	936	0.15	0.0225	             0.27

	81	7	567	3.15	9.9225	            69.4575

	84	16	1344	6.15	37.8225	           605.16

sum		60	4671			           1321.65

		mean	77.85		          Variance 22.4

					               SD 4.732863826



                                                   



42 45 8 18 45 15 31 46 

3 33 2 6 32 47 36

 42	27.26666667	14.733	217.071

45	27.26666667	17.733	314.471

8	27.26666667	-19.267	371.204

18	27.26666667	-9.267	85.871

45	27.26666667	17.733	314.471

15	27.26666667	-12.267	150.471

31	27.26666667	3.733	13.938

46	27.26666667	18.733	350.938

3	27.26666667	-24.267	588.871

33	27.26666667	5.733	32.871

2	27.26666667	-25.267	638.404

6	27.26666667	-21.267	452.271

32	27.26666667	4.733	22.404

47	27.26666667	19.733	389.404

36	27.26666667	8.733	76.271

409			4018.933

27.26666667		Variance	287.067

845.2666667		SD	16.94305167

 

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