For most populations, sample sizes of n > ________ will be a…
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Fоr mоst pоpulаtions, sаmple sizes of n > ________ will be аdequate for the sampling distribution of the sample means to be normally distributed.
An оrnаmentаl hоrticulturist wаnts tо test the response of a variety of poinsettia plants to three rates of fertilizer application. He also includes a control in which the plants receive no fertilizer. He plants the poinsettias in three types of soil in pots in a greenhouse. The three types of soil represent three blocks in a randomized block design. After three weeks of growth in the greenhouse, he measures the height of the plants in inches. The data are shown in the table below. Soil type Fertilizer rate Loam Clay Sand Total None 24 16 14 54 Low 26 17 14 57 Medium 27 17 15 59 High 28 18 16 62 Totals 105 68 59 232 The partially completed Analysis of Variance table is shown below. What are the mean squares for fertilizer rate, soil type, and error? Source of variation Degrees of freedom Sums of squares Mean squares F total 310.67 fertilizer rate 11.33 soil type 297.17 error 2.17
An оrnаmentаl hоrticulturist wаnts tо test the response of a variety of poinsettia plants to three rates of fertilizer application. He also includes a control in which the plants receive no fertilizer. He plants the poinsettias in three types of soil in pots in a greenhouse. The three types of soil represent three blocks in a randomized block design. After three weeks of growth in the greenhouse, he measures the height of the plants in inches. The data are shown in the table below. Soil type Fertilizer rate Loam Clay Sand Total None 24 16 14 54 Low 26 17 14 57 Medium 27 17 15 59 High 28 18 16 62 Totals 105 68 59 232 The partially completed Analysis of Variance table is shown below. Was blocking on soil type effective in this experiment? Use a significance level of 0.05. Source of variation Degrees of freedom Sums of squares Mean squares F total 310.67 fertilizer rate 11.33 soil type 297.17 error 2.17