A study was performed looking at the effect of mean ozone exposure on change in pulmonary function. Fifty hikers were recruited into the study; 25 study participants hiked on days with low-ozone exposure, and 25 hiked on days with high-ozone exposure. The change in pulmonary function after a 4-hour hike was recorded for each participant. The results are given in the table below. (Let population 1 be high-ozone exposure and population 2 be low-ozone exposure. Use high-low.) Comparison of change in FEV on high-ozone vs. low-ozone days Ozone level Mean change in FEV* 0.108 High Low LA USE SALT 0.041 sd n 0.252 25 0.101 25 (a) What test can be used to determine whether the mean change in FEV differs between the high-ozone and low-ozone days? (You may need to use the Distribution Calculators page in SALT to check conditions.) paired t test two-sample t test for independent samples with equal variances F test for the equality of two variances two-sample t test for independent samples with unequal variances (b) Implement the test in part (a), and report a p-value (two-tailed). (Use a = 0.05.) State the null and alternative hypotheses (in L). (Enter != for as needed.) Ho: H₁ H₂ ✓ H₂: H₂!=H₂ ✓ Find the test statistic. (Round your answer to two decimal places.) 0.94 x Use technology to find the p-value. (Round your answer to four decimal places.) p-value=

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