Is sample sufficient to demonstrate the significant effect

Reference no: EM13109605

State College is estimating the new English composition course for freshmen. Random sample of n = 25 freshmen is obtained and students are placed in course during their first semester. One year later, writing sample is obtained for each student and writing samples are graded using standardized evaluation technique. Average score for sample is M = 76. For general population of college students, writing scores form the normal distribution with the mean of µ = 70.

a. If writing scores for population have standard deviation of σ = 20, does sample give adequate evidence to conclude that new composition course has significant effect?

b. If population standard deviation is σ = 10, is sample sufficient to demonstrate the significant effect? Again, suppose a two-tailed test with α = .05.

c. Briefly describe why you reached different conclusions for part (a) and part (b).

Reference no: EM13109605

Questions Cloud

Which two species concepts are most likely to place dogs : Dogs (Canis lupus familiaris) and gray wolves (Canis lupus) can interbreed to produce viable, fertile offspring. These species shared a common ancestor recently.

What does an increase in the driving pressure correspond to : In human body, substances from blood filter through a membrane into renal tubule (kidney). What does an increase in the driving pressure correspond to?

Determine the probability of waiting in line : Sharp Discounts Wholesale Club has two service desks, one at each entrance of the store. Customers arrive at each service desk at an average of one every six minutes.

What are four pieces of evidence : Why do plant cells have mitochondria, but animal cells don't have chloroplasts? Give a phylogenic explanation.

Is sample sufficient to demonstrate the significant effect : If writing scores for population have standard deviation of σ = 20, does sample give adequate evidence to conclude that new composition course has significant effect?

Identify the the solute and solution in a hot chocolate : Identify the the solute and solution in a hot chocolate solution that is made of chocolate syrup and warm milk.

How organization vision connected to organizational strategy : How critical is Vision to Strategy and in your experience, how well has your organization's vision (assuming one is in place) been connected to the organizational strategy?

How cluster determination helps on determination : how they (cluster determination,restriction digest) connect to each other.

Classify the phases of the strategic management process : Please classify the phases of the strategic management process. Compare domestic as well as international approaches for each phase.

User Account

All Pages