1 .* A certain stimulus administered to each of the 1} patients resulted in the following increase of blood pressure : 5. 2. 8. - 1. 3. 0. - 2. 1 . 5. 0. 4 . 6. 8. Can it be concluded that the stimulus , in general , be accompanied by an increase in the blood pressure?" 2 . . The manufacturer of a certain make of electric bulbs claims that his bulbs have a mean life of 25 months with a standard deviation of'S months . Random samples of 6 such bulbs have the following values : Life of bulbs in months : 24 . 20. 30, 20, 20, and 18 . Can you regard the producer's claim to valid at 1%'s level of significance ?" ` . the life time of electric bulbs for a random sample of 10 from a large consignment gave the following data : 4. 2. 4.6. 3.9. 4. 1. 5. 2. 3.8. 3.9. 4.3. 4. 4. 5.6 ( in`90 hours ) Can we accept the hypothesis that the average life time of bulbs is 4 , 000 hours Data on weight ( grams ) of two treatments of N MILT ( nistroso - methyl urea ) are* recorded . Find out whether these two treatments have identical effects by using + test for sample means at 5%' level of significance . Sample 1 |2 | 3 | 4 | 5 | 6 | 7| 8| 9 / 10| 11 / 12 Treatments 0. 2 90| 2.0 | 2.7 / 2.9 / 1.9 | 2.1 | 2.6 | 2.7 | 29 | 3.0 | 2.6| 2.6 | 2.7 0. 49/0 \\3.2 | 3.6 | 3. 7 | 3.5 | 2.9 | 2.6 | 2.5 | 2.7| 5 . Hypothesis Tests for Two Means : Independent Data : Here we test for a difference in means for the following data NO 237 | 289 | 357| 228 | 303 | 275| 202 | 304 | 244 | 233 Drug ( x 1 ) Drug ( x 2 ) | 194 | 240 | 230| 186 | 265 | 272 | 242 | 281 | 240 | 212