Working Breath Rate Two random samples of 33 individuals were selected. One sample participated in an activity which simulates hard work. The average breath rate of these individuals was 22 breaths per minute. The other sample did some normal walking. The mean breath rate of these individuals was 14. Find the 90% confidence interval of the difference in the breath rates if the population standard deviation was 4.1 for breath rate per minute. Use for the mean breath rate of individuals stimulated with hard work. Round the answers to at least one decimal place. Use a TI-83 Plus/TI-84 Plus calculator. Literacy Scores Adults aged 16 or older were assessed in three types of literacy: prose, document, and quantitative. The scores in document literacy were the same for 19- to 24-year-olds and for 40- to 49-year-olds. A random sample of scores from a later year showed the following statistics. Age group Mean score Population standard deviation Sample size 19-24 40-49 280 56.2 40 315 52.1 35 Send data to Excel Construct a 95% confidence interval for the true difference in mean scores for these two groups. Round the answers to at least one decimal place. |