The product of the slopes of two non-vertical perpendicular lines is always -1. it is not possible for two perpendicular lines to both have a positive slope because the product of two positives is positive. so for the product of the slopes to be -1, one of the slopes must be positive and the other negative. select the best answer from the choices provided
true or false

Now, martin can reasonably guess that the standard deviation for the entire population of people at the mall during the time of the survey is $1.50. what is the 95% confidence interval about the sample mean? interpret what this means in the context of the situation where 95 people were surveyed and the sample mean is $8. use the information in this resource to construct the confidence interval.