Biostat iv subjective

A sample of 25 fruits fly [Drosophila melanogaster] larva was incubated at 37 degree centigrade for 30 minutes. It is theorized that such exposure to heat causes polygene chromosome located in the salivary glands of the fly to unwind, creating puffs on the chromosomes arm, that visible under a microscope. The average number of puffs for the 25 observations was 4.3 with a SD of 2.0. Test the hypothesis that average number of puffs in population is 4.5.

A sample of 30 plants from a population of a certain species has a mean height 13 cm with variance 14 cm2, whereas a second sample of 25 plants from another population of plants of same species has mean height 10 cm, with variance 13 cm2. Test the hypothesis that first population taller than second population. What is the chance that in next 5 minutes call center receives only one call

A botanist has produced a new variety of hybrid wheat that is better able to withstand drought than other varieties. He knows that 80% of the seeds from the parent plants germinate. He claims the hybrid has the same germination rate. To test this claim, 400 seeds from the hybrid plant are tested and 312 germinated. Test the botanist claim at a 5% level of significance.

The following data is about weight change of humans, tabulated after administration of a drug proposed to result in weight loss. Each weight change (in Kg) is the weight after minus the weight before drug administration: 0.2, - 0.5, - 1.3, - 1.6, - 0.7, 0.4, - 0.1, 0.0, - 0.6, - 1.1, - 1.2, - 0.8. Test the hypothesis the there is no effect of using the drugs.