The average indoor radon level is about 1.3 picocuries per liter (pCi/L) in the United States. A random sample of Jersey Village homes had a mean indoor radon level of 1.5 pCi/L. A 95% confidence interval for the mean indoor radon level in Jersey Village homes is (1.29, 1.71). Is the average indoor radon level significantly higher than the average radon level in the U. S.

Sera sells t-shirts at the beach. she believes the price of a t-shirt and the number of t-shirts sold are related. she has been experimenting with different prices for the t-shirts. she has collected a data set with five pairs of data; each consists of the price of a t-shirt and the number of shirts sold. the independent variable, which will go on the x-axis, is . the dependent variable, which will go on the y-axis, is the