Mathematics, 13.11.2019 23:31 munziruddin204
In a field of barley the grain, y_i, and the grain plus straw, x_i, were weighted for each of a large number of sampling units located at random over the field. the total produce (grain plus straw) of the whole field was also weighed. the following data were obtained: c_yy = 1.13, c_yx = 0.78, c_xx = 1.11. compute the gain in precision by estimating the grain yield of the field from the ratio of grain to produce instead of from the mean yield of grain unit. it requires 20 min to cut, thresh, and weigh the grain on each unit, 2 min to weigh the straw on each unit, and 2 hr to collect and weigh the total produce of the field. how many units must be taken per field in order that the ratio estimate may be more economical than the mean per unit?
Answers: 1
Mathematics, 21.06.2019 14:00, moutchyjoseph
Ateacher asked his students to vote for an animal to be their class pet. five-eighteenths of the students voted for a rabbit, voted for a snake, and voted for a hamster. which statement is true? more students voted for a hamster than a snake. more students voted for a snake than a rabbit. more students voted for a rabbit than a hamster. more students voted for a snake than a hamster.
Answers: 3
Mathematics, 21.06.2019 18:00, leysirivera23ovez6n
The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?
Answers: 1
In a field of barley the grain, y_i, and the grain plus straw, x_i, were weighted for each of a larg...
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