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A plant physiologist is planning to measure the stem lengths of soybean plants after two weeks of growth using a new fertilizer. Previous experiments suggest that the standard deviation is 1.3 cm. Using this as a guess for σ, determine how many soybean plants the researcher should have if she wants the standard error to be no more than 0.2 cm. Note that for sample size calculation we always round up to the nearest whole number. So for example if when you do the calculation you find n = 20.1 you round up to 21 You do not round down to 20 just because it is closer, because you want a sample size that gives standard error to be no more than 0.2 cm.
a beam has a solid square cross section of 100mm and is simply supported by two supports 3 metres apart. cauculate the
It is known that the mean lacunarity measurement for all grassland pixels is 220. Do the data suggest that the area sampled is grassland? Test at α = .01.
A question has these possible choices - excellent, very good, good, fair, and unsatisfactory. How many degrees of freedom are there using the goodness-of-fit test to the sample results?
A teacher figure that final grades in the statistics department are distributed as A,25%, B, 25%, C, 40%, D, 5%, F, 5%. At the end of the randomly selected semester, the following number grades were recorded.
Dunn Poitiac has compiled the following sales data regarding the number of cars sold over the past 60n selling days. Answer the following questions for the sales data shown.
What is the probability that there will be no shark attacks?- What is the probability that between two and five shark attacks inclusive will occur?
in a group of five items two are defective. find the distribution of n the number of draws we need to find the first
Suppose prior elections in Louisiana indicated it is necessary for a candidate for governor to receive at least 80 percent of the vote in the northern part of the state to be elected.
A random sample of 20 one-way fares during particular month had a mean of $210 with a standard deviation of $43. At 0.02, is there sufficient evidence to conclude a difference from the stated mean?
Refer to Computer-assisted learning Problem 11. 6. Demonstrate numerically that the weighted least squares estimates obtained in part (e) are identical to those obtained Using transformation (11.23) and ordinary least squares.
question test the claim that 14 of a candy makers candies are red. use a 0.05 significance and the table to answer the
Here are the DMS odor thresholds for 10 untrained students:
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