probablity and statistics

0 pts ended
State college is evaluating a new English composition course for freshmen. A random sample of n = 25 freshmen is obtained and the students are placed in the course during their first semester. One year later, a writing sample is obtained for each student and the writing sample are graded using a standardized evaluation technique. The average score for college students, writing scores form a normal distribution with a mean of µ =70.
a.If the writing scores for the population have a standard deviation of s = 20, does the sample provide enough evidence to conclude that the new composition course hes a significant effect? Assume a two-tailed test with a = .05.
b. If the population standard deviation is s = 10, is the sample sufficient to demonstrate a significant effect? Again, assume a two-tailed test with a = .05.
c. Comparing your answers for parts a and b, explain how the magnitude of the standard deviation influences the outcome of a hypothesis test.

Answers (1)

  • Arnold85
    Rating:4 stars

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