A random sample of n1 = 16 communities inwestern Kansas gave the following information for people under 25years of age.
x1: Rate of hay fever per 1000population for people under 25
| 98 | 90 | 120 | 128 | 92 | 123 | 112 | 93 |
| 125 | 95 | 125 | 117 | 97 | 122 | 127 | 88 |
A random sample of n2 = 14 regions inwestern Kansas gave the following information for people over 50years old.
x2: Rate of hay fever per 1000population for people over 50
| 97 | 110 | 103 | 96 | 114 | 88 | 110 |
| 79 | 115 | 100 | 89 | 114 | 85 | 96 |
1. Calculate S1, round to two decimalplaces
2. What is the value of the sample test statistic?Compute the corresponding z or t value asappropriate. (Test the difference μ1 − μ2. Donot use rounded values. Round your answer to three decimalplaces.)
3. Find a 90% confidence interval for μ1 −μ2. (Round your answers to two decimalplaces.)
Upper Limit =
Lower Limit =
