You have just been hired by the Stampeder Marketing Company to conduct a survey to estimate the mean amount of money spent by movie patrons (per movie) in Alberta. First use the range rule of thumb to make a rough estimate of the standard deviation of the amounts spent. It is reasonable to assume that typical amounts range from $3 to about $15. Then use that estimated standard deviation to determine the sample size corresponding to 98% confidence and a 25# margin of error.