Questions M1.9 We are interested in determining whether there is an effect of the addition of nitrate fertiliser on the mean height of Brassica crops. Two fields are treated identically apart from the use of fertiliser on one but not the other. Mature plants from each field were then chosen at random and the heights measured. Generate a null and alternative hypothesis on the effect of fertiliser on crop growth The sample data collected from the two fields is as follows. Calculate the t-value and determine if there is a significant difference between the two treatments Height of crop when Height of crop when no nitrate fertiliser added fertiliser added (cm) (cm) n = 24 n = 23 101 Mean 142 18 Standard deviation 23 = 6.8 The average time between the production of two RNA transcripts from the same strand of DNA in a cell is known as the we wish to know whether ‘synthesis time’, products that take longer to be synthesised by a cell also last longer or whether they are targeted for degradation at the same rate. To do this the (the time “half-life” needed for half of a batch of mature RNAs to degrade) was measured for each transcript separately. RNA molecule Synthesis time (s) “Half-life”(s) 1 240 98 2 230 203
Questions M1.9 We are interested in determining whether there is an effect of the addition of nitrate fertiliser on the mean height of Brassica crops. Two fields are treated identically apart from the use of fertiliser on one but not the other. Mature plants from each field were then chosen at random and the heights measured. Generate a null and alternative hypothesis on the effect of fertiliser on crop growth The sample data collected from the two fields is as follows. Calculate the t-value and determine if there is a significant difference between the two treatments Height of crop when nitrate fertiliser added (cm) n = 23 Height of crop when no fertiliser added (cm) n = 24 Mean 142 101 Standard deviation 23 18 = 6.8 The average time between the production of two RNA transcripts from the same strand of DNA in a cell is known as the ‘synthesis time’, we wish to know whether products that take longer to be synthesised by a cell also last longer or whether they are targeted for degradation at the same rate. To do this the “half-life” (the time needed for half of a batch of mature RNAs to degrade) was measured for each transcript separately. RNA molecule Synthesis time (s) “Half-life”(s) 1 240 98 2 230 203
418729-m1-summary-quiz.docx