Question

"Durable press" cotton fabrics are treated to improve their recovery from wrinkles after washing. "Wrinkle recovery angle" measures how well a fabric recovers from wrinkles. Higher is better. Here are data on the wrinkle recovery angle (in degrees) for a random sample of fabric specimens. Assume the populations are approximately normally distributed with unequal variances. A manufacturer believes that the mean wrinkle recovery angle for Hylite is better. A random sample of 25 Permafresh (group 1) and 20 Hylite (group 2) were measured. Test the claim using a 1% level of significance.

EXPLAIN ALL STEPS ON THE TI-84

Permafresh	Hylite
148	137
128	139
156	143
118	132
117	140
154	145
135	143
129	145
136	134
151	145
128	134
114	143
125	134
157	135
122	146
163	137
146	139
126	138
90	141
131	139
120
135
133
146
146

H₀: Select an answer μ σ² s² x̄₁ μ₁ x̄₂ μ₂ p  = Select an answer x̄₂ μ₂ p x̄₁ μ₁ s² μ σ²  
H₁: Select an answer σ² p μ₂ s² μ₁ μ x̄₁ x̄₂  Select an answer = ≠ ≤ < > ≥  Select an answer μ s² μ₂ x̄₂ μ₁ p σ² x̄₁  

Select the correct symbols.

Test Statistic= Give answer to 4 decimal places.

p-value=

Give answer to 4 decimal places.

Answer 1