A researcher wants to estimate the mean number of hours students study per week in a high school. The researcher surveys 50 students in the school library and finds a mean of 6.5 hours. Which statement is the most reasonable conclusion?
The average number of hours all students study per week is 6.5.
The sample is likely to overestimate the mean because it’s not randomly selected.
The sample size is insufficient for any estimate.
The sample provides an unbiased estimate because it includes 50 students.
