A drug company claims that their products' contaminations never vary by more than 2%. Sample of 5 specimens were tested and the percentages of the purities are recorded as 3. Observation no. 1 2 3 4 5...

a. Do the sample data have enough proof to oppose the manufacturer’s claim? (HINT: take the
range of 2% equal 4σ.)
b. Find a 90% confidence interval for σ2.

The value of H is 3 and the value of I is 2.

significance level is 0.05

Extracted text: A drug company claims that their products' contaminations never vary by more than 2%. Sample of 5 specimens were tested and the percentages of the purities are recorded as 3. Observation no. 1 2 3 4 5 Percentages (%) 98 + (I/10) 97+ (H/10) 98.9 97.7 97.9