Question: Twelve Dozenol tablets are tested for solubility before and after being stored for one year. The indexes of solubility are given in the table below.

Twelve Dozenol tablets are tested for solubility before and after being stored for one year. The indexes of solubility are given in the table below.

a. At the 0.05 significance level, test the claim that the Dozenol tablets are more soluble after the storage period.
b. Construct a 95% confidence interval estimate of the mean difference of after - before.

Before | 472 487 506 512 489 503 $11 501 495 504 494 462 After 562 512 523 528 554 513 516 510 S24 510 524 508

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