Ackerman and Goldsmith (2011) found that students who studied text from printed hardcopy had better test scores than students who studied text presented on the screen. In a related study, a professor noticed that several students in a large class had purchased the e-book version of the course textbook. For the final exam, the overall average for the entire class was μ= 81.7, but the sample of n = 9 students who used e-books had a mean of M = 77.2 with ((SS =392) Is the sample sufficient to conclude that scores for students using e-books were sufficiently different from scores for the regular class? Use a two-tail test with α= .01.(not .05). n = df =
Ackerman and Goldsmith (2011) found that students who studied text from printed hardcopy had better test scores than students who studied text presented on the screen. In a related study, a professor noticed that several students in a large class had purchased the e-book version of the course textbook. For the final exam, the overall average for the entire class was μ= 81.7, but the sample of n = 9 students who used e-books had a mean of M = 77.2 with ((SS =392)
Is the sample sufficient to conclude that scores for students using e-books were sufficiently different from scores for the regular class? Use a two-tail test with α= .01.(not .05).
n =
df =
M =
μ =
SS =
s2 =
sM
b. State the hypotheses and select alpha
c. Locate critical region for stated alpha
d. Compute test statistic (t-score)
Sample variance s²:
Estimated standard error sₘ:
Computed t statistic:
e. Make a decision about the null hypothesis and state a conclusion.
Solution :
Given information:
a) n= 9 sample size
Degrees of freedom =df=n-1=9-1=8
M=77.2 Sample mean
SS= 392 sum of square
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