A random sample of 25 third graders scored an average of 3.2 on a standardized reading test. The standard deviation was 0.95. What is the value of the t-test statistic for determining if the mean score is significantly higher than 3?
A) t = 0.21
B) t = 5.26
C) t = 1.05
D) None of the above

Question

Quizplus · Accepted Answer

The t-test statistic is calculated using the formula: t = (X̄ - μ) / (s/√n), where X̄ is the sample mean, μ is the population mean, s is the standard deviation, and n is the sample size. Plugging in the values: t = (3.2 - 3) / (0.95/√25) = 1.05.

A Random Sample of 25 Third Graders Scored an Average