A fashion industry analyst wants to prove that models featuring Liz laiborne clothing earn on average more than models featuring clothes designed by Calvin Klein. For a given period of time, a random...

A fashion industry analyst wants to prove that models featuring Liz laiborne clothing earn on average more than models featuring clothes designed by Calvin Klein. For a given period of time, a random sample of 32 Liz Claiborne models reveals average earnings of $4,238.00 and a standard deviation of $1,002.50. For the same period, an independent random sample of 37 Calvin Klein models has mean earnings of $3,888.72 and a sample standard deviation of $876.05