# Question: An instructor has decided to introduce a greater component of

An instructor has decided to introduce a greater component of independent study into an intermediate microeconomics course as a way of motivating students to work independently and think more carefully about the course material. A colleague cautions that a possible consequence may be increased variability in student performance. However, the instructor responds that she would expect less variability. From her records she found that in the past, student scores on the final exam for this course followed a normal distribution with standard deviation 18.2 points. For a class of 25 students using the new approach, the standard deviation of scores on the final exam was 15.3 points.

Assuming that these 25 students can be viewed as a random sample of all those who might be subjected to the new approach, test the null hypothesis that the population standard deviation is at least 18.2 points against the alternative that it is lower.

Assuming that these 25 students can be viewed as a random sample of all those who might be subjected to the new approach, test the null hypothesis that the population standard deviation is at least 18.2 points against the alternative that it is lower.

**View Solution:**## Answer to relevant Questions

Explain carefully the distinction between each of the following pairs of terms. a. Null and alternative hypotheses b. Simple and composite hypotheses c. One-sided and two-sided alternatives d. Type I and Type II errors e. ...Supporters claim that a new windmill can generate an average of at least 800 kilowatts of power per day. Daily power generation for the windmill is assumed to be normally distributed with a standard deviation of 120 ...Prairie Flower Cereal, Inc., has asked you to study the variability of the weights of cereal bags produced in plant 2, located in rural Malaysia. The package weights are known to be normally distributed. Using a random ...A recent report from a health-concerns study indicated that there is strong evidence of a nation's overall health decay if the percent of obese adults exceeds 28%. In addition, if the low-income preschool obesity rate ...You have been asked to determine if two different production processes have different mean numbers of units produced per hour. Process 1 has a mean defined as µ1 and process 2 has a mean defined as µ2. The null and ...Post your question