A second lab reports the following flammability ratings. Compute the sample variance. Lab B ratings: 21.622.420.821.922.123.021.722.620.9 What is the sample variance for Lab B?

In Excel, Column G contains the exact dollar amount of each customer transaction, including 0.00 and decimal values such a s42.75. What is the best classification?

A random sample of 18 lab test batches has a mean turnaround time of 31.4 hours and a sample standard deviation of 6.6 hours. A 99% confidence interval will be constructed for the population mean turnaround time.

A one-way ANOVA compares mean heat-resistance scores from 5 coating formulas. The p-value is 0.009 at α = 0.05. Which interpretation is correct?

For a two-tailed chi-square variance test with α=0.06 and df=18, the right critical value should be computed in Excel as: =CHISQ.INV.RT(0.06,18)

A disease-testing center finds that 12% of people tested are positive. Assuming independence, what is the probability that the next 3 people tested are all negative? (round to 3 decimals)

At a clinic, 18% of patients arriving for a screening test positive for a condition. Assuming independent outcomes, what is the probability that the next 2 patients both test positive? (round to 3 decimals)

In Excel, Column F contains customer-service ratings coded as 1 = Very Poor, 2 = Poor, 3 = Fair, 4 = Good, 5 = Excellent. The values show order, but the psychological distance between categories is not guaranteed equal. What is the best classification?

A sample of checkout times is: 144, 132, 144, 150, 161, 132, 170 Which statement correctly describes the mode?

A random sample of 875 subscription customers finds that 57 canceled within the first month. Construct a 98% confidence interval for the true population proportion of customers who cancel within the first month. Which interval is correct?