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  3. 2. the data set (concrete1.xlsx) contains the comp

2. The data set (Concrete1.xlsx) contains the compressive strength, in thousands of pounds per square inch...

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Question

Basic Math

2. The data set (Concrete1.xlsx) contains the compressivestrength, in thousands of pounds per square inch (psi), of 30samples of concrete taken two and seven days after pouring.(You need to use The Paired Difference Test).

(a) At the 0.10 level of significance, is there evidence of adifference in the mean strengths at two days and at seven days?

(b) Find the p-value in (a) and interpret its meaning.

(c) At the 0.10 level of significance, is there evidence thatthe mean strength is lower at two days than at seven days?

(d) Find the p-value in (c) and interpret its meaning.

SampleTwo DaysSeven Days
12.8303.505
23.2953.430
32.7103.670
42.8553.355
52.9803.985
63.0653.630
73.7654.570
83.2653.700
93.1703.660
102.8953.250
112.6302.850
122.8303.340
132.9353.630
143.1153.675
152.9853.475
163.1353.605
172.7503.250
183.2053.540
193.0004.005
203.0353.595
211.6352.275
222.2703.910
232.8952.915
242.8454.530
252.2052.280
263.5903.915
273.0803.140
283.3353.580
293.8004.070
302.6803.805

Answer & Explanation Solved by verified expert
3.6 Ratings (267 Votes)
a From the given dataSampleTwo DaysSeven    See Answer
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