A group of statistics students decided to conduct a survey at their university to find the average (mean)amount of time students spent studying per week. They sampled 240 students and found a mean of 22.3 hours per week. Assuming a population standard deviation of six hours,what is the 99% level of confidence?
A)[21.80,22.80]
B)[16.3,28.3]
C)[21.30,23.30]
D)[20.22,22.0]

Question

Quizplus · Accepted Answer

The 99% confidence interval is calculated using the formula: mean ± (Z * (σ/√n)), where Z is the Z-score for 99% confidence (approximately 2.576), σ is the population standard deviation, and n is the sample size. This results in [21.30, 23.30].

A Group of Statistics Students Decided to Conduct a Survey