A sales manager for a large department store believes that customer spending per visit with a sale is lower than customer spending without a sale. and would like to test that claim. A simple random sample of customer spending is taken from without a sale and with a sale. The results are shown below. Without sale W sale Mean 3230.1 r1315 Variance 1984.96 1325.41 Observations 200 150 Hypothesized Mean Difference 0 df 323 t Stat 4.465 P[T 4:1] onetail CLDDH t Critical one-tail 4.65 P[T=t] two-tall 0.014: t Critical two-tall 4.95? Condence Level 99% 3 2 I U I Q 3 : Ex: 1.234 $ Samples from without sale: ammo\"; 2 Ex: 9 t _ Samples from with sale: \"mm : Point estimate for spending without sale: Ewitmt : Ex; \"1.234 Point estimate for spending with sale: 5mm