A random sample of 64 SAT scores of students applying for merit scholarships showed an average of 1400 with a standard deviation of 240. If we want to provide a 95% confidence interval for the population mean SAT score, the degrees of freedom for reading the t value is
A) 60.
B) 61.
C) 62.
D) 63.

Question

Quizplus · Accepted Answer

The degrees of freedom for a t-distribution, when estimating a population mean from a sample, is calculated as the sample size minus one. Here, with a sample size of 64, the degrees of freedom is 64 - 1 = 63.

A Random Sample of 64 SAT Scores of Students Applying