# Question: In the past the standard deviation of weights of certain

In the past the standard deviation of weights of certain 32.0-oz packages filled by a machine was 0.25 oz. A random sample of 20 packages showed a standard deviation of 0.35 oz. Is the apparent increase in variability significant at the 0.10 level of significance? Assume package weight is normally distributed.

a. Solve using the p-value approach.

b. Solve using the classical approach.

a. Solve using the p-value approach.

b. Solve using the classical approach.

## Answer to relevant Questions

Variation in the life of a battery is expected, but too much variation would be of concern to the consumer, who would never know if the purchased battery might have a very short life. A random sample of 30 AA batteries of a ...Using the computer output in Exercise 9.141, determine the values of the following terms: a. Hypothesized value of population standard deviation b. Sample standard deviation c. Degrees of freedom—how were they ...Use a computer or calculator to find the p-value for the following hypothesis test: Ho: s = 12.4 versus Ha: s_12.4, if x2 = 36.59 for a sample of n = 24. Getting a college education today is almost as important as breathing and it’s expensive! It is not just the tuition, room, and board; textbooks are expensive too. It is very important for students, and their parents, to ...The marketing research department of an instant coffee company conducted a survey of married men to determine the proportion of married men who prefer their brand. Of the 100 men in the random sample, 20 prefer the ...Post your question