Strength of concrete: The compressive strength, in kilopascals, was measured for concrete blocks from five different batches of concrete, both three and six days after pouring. The data are as follows. Can you conclude that the mean strength after three days is less than the mean strength after six days? Let u, represent the mean strength after three days and u, = 4, -H. Use the olo a = 0.10 level and the P-value method with the TI-84 Plus calculator. Block 1 3 4 After 3 days 1304 1321 1367 1352 1380 After 6 days 1319 1348 1363 1364 1386

Strength of concrete: The compressive strength, in kilopascals, was measured for concrete blocks from five different batches of concrete, both three and six days after pouring. The data are as follows. Can you conclude that the mean strength after three days is less than the mean strength after six days? Let u, represent the mean strength after three days and u, = 4, -H. Use the olo a = 0.10 level and the P-value method with the TI-84 Plus calculator. Block 1 3 4 After 3 days 1304 1321 1367 1352 1380 After 6 days 1319 1348 1363 1364 1386

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Strength of concrete: The compressive strength, in kilopascals, was measured for concrete blocks from five different batches of
concrete, both three and six days after pouring. The data are as follows. Can you conclude that the mean strength after three
days is less than the mean strength after six days? Let u, represent the mean strength after three days and u, = 4, -Hh. Use the
a = 0.10 level and the P-value method with the TI-84 Plus calculator.
Block
1
2
3
4
After 3 days
1304
1321
1367
1352
1380
After 6 days
1319
1348
1363
1364
1386
Send data to Excel
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5/27/2021
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bac
&
7.
%24
8.
6.
3.

Part: 0 / 4
Part 1 of 4
(a) State the null and alternate hypotheses.
Ho: 0
H: 0
This hypothesis test is a left-tailed
▼ test.
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