Statistics question! Please help~
The question reads: A random sample of shoppers at a convenience store are selected to see how much they spent on that visit. The standard deviation of the population is $6.43. How large a sample must be selected if the researcher wants to be 99% confident of finding whether the true mean differs from the sample mean by $1.50?
I think σ = 6.43, confidence level = 2.58, and X bar = 1.50? I'm kinda lost with this one.

Question

Statistics question! Please help~ 
The question reads: A random sample of shoppers at a convenience store are selected to see how much they spent on that visit. The standard deviation of the population is $6.43. How large a sample must be selected if the researcher wants to be 99% confident of finding whether the true mean differs from the sample mean by $1.50?
I think σ = 6.43, confidence level = 2.58, and X bar = 1.50? I'm kinda lost with this one.

theopenstudyowl · Answer

It appears the question is only asking you how large the sample must be, and I believe an accurate sample size would be 10.