Let’s say you were to roll two dice 1000 times.  What is the number of times you would expect the number 7 to appear?

 
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Question 2.

The Analysis1_DescriptiveStats worksheet contains several additives for concrete.  For this question, we want you to focus specifically on the 
ash additive.

You should use all of the data in the dataset, but assume that the data is a sample. 
What is the standard deviation (round to the nearest 4 decimal places)?
example 12.33414 –; 12.3341
example 48.39208 –; 48.3921

 
Flag question: Question 3

Question 3.

The Analysis1_DescriptiveStats worksheet contains several additives for concrete.  For this question, we want you to focus specifically on the 
air ent admix additive.

What is the mean (round to the nearest 4 decimal places)?  example 48.39208 –; 48.3921

 
Flag question: Question 4

Question 4.

The Analysis1_DescriptiveStats worksheet contains several additives for concrete.  
Which additive shows the highest relative standard deviation?
Group of answer choices

cement

slag

ash

water

superplastic

air_ent_admix
 
Flag question: Question 5

Question 5.

What can you tell us about how the Coefficient of Variation might be related to skewness?  Use the data from the Analysis1_DescriptiveStats worksheet for your answer.
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Flag question: Question 6

Question 6.

Use the Analysis2_Correlation worksheet for this question.
Compare the most expensive additive (cement) with the overall Strength. 
What patterns to you see?  Does one have to invest heavily in Cement to achieve a strong concrete mixture?
In a sentence or two, what is happening with any outlier groups?  
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Concrete Data

region	cement	slag	ash	water	superplastic	coarseagg	fineagg	air ent admix	strength
midwest	331	0	0	192	0	879	825	3	13.52
midwest	154	174	185	228	7	845	612	28	24.34
midwest	236.9	91.7	71.5	246.9	6	852.9	695.4	28	28.63
midwest	108.3	162.4	0	203.5	0	938.2	849	3	2.33
midwest	380	95	0	228	0	932	594	7	32.82
midwest	184	86	190	213	6	923	623	28	22.93
midwest	108.3	162.4	0	203.5	0	938.2	849	7	7.72
midwest	170.3	155.5	0	185.7	0	1026.6	724.3	7	10.73
midwest	155	0	143	193	9	877	868	28	9.74
midwest	212	141.3	0	203.5	0	973.4	750	3	6.81
midwest	102	153	0	192	0	887	942	7	7.68
midwest	255	0	0	192	0	889.8	945	3	8.2
midwest	380	95	0	228	0	932	594	28	36.45
midwest	166.8	250.2	0	203.5	0	975.6	692.6	3	6.9
midwest	284	15	141	179	5.5	842	801	7	24.13
midwest	299.8	0	119.8	211.5	9.9	878.2	727.6	28	23.84
midwest	144.8	0	133.6	180.8	11.1	979.5	811.5	28	13.2
midwest	151.6	0	111.9	184.4	7.9	992	815.9	28	12.18
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