Value of df for a test
For the chi-square test for goodness of fit, what is the value of df for a test with four categories and a sample of n = 100?
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A sample of n = 25 individuals is selected from a population with fx = 80 and a treatment is administered to the sample. If the treatment has no effect, then
The temperature at a point 31 miles north of a station is 5.5 F cooler than at the station. If the wind is blowing from the northeast at 45mph and the air is being heated by radiation at the rate of 1 degree celcius per hours, what is the local te
A repeated-measures study finds a mean difference of MD = 5 points between two treatment conditions. Which of the following sample characteristics is most likely to produce a significant t statistic for the hypothesis test?
Helium is used to operate an 18 hp gas turbine. The gas enters the steady-flow device at 220 ft/s through an area of 0.020 ft2. The inlet state is 40 psia and 440OF. Compute the heat transfer rate in Btu/min.
Do the sample data support the conclusion that the Memory Booster has a significant effect? Test with a = .05. Compute Cohen's d to measure the size of the treatment effect.
The following data are from an independent-measures experiment comparing two treatment conditions. Do these data indicate a significant difference between the treatments at the .05 level of significance?
Calculate the mass an linear absorption coefficients of air for Cr K alpha radiation. Assume that air contains 80 % nitrogen and 20 % oxygen by weight and has a density of 1.29*10^-3 g.cm^3.
A sample of n = 9 has a mean of M = 72 with SS = 162. Use the sample to make a point estimate of u and to construct the 90% confidence interval for mue.
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