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What two assumptions must be met when you are using the z test to test differences between two means? Can the sample standard deviations s1 and s2 be used in place of the population standard deviations σ1 and σ2?
Sample sizes and standard deviations from the PROC TTEST printout and calculate the pooled estimate of variance
What research design was used this study
1. Briefly describe your area of research interest (1-3 sentences is sufficient).2. List 4 variables that you might assess in a research project related to your research area. List one for each type of measurement scale: Nominal, ordinal, interval, a..
A survey claims that 9 out of 10 doctors recommend aspirin for their patients with headaches.
The numbers in the row labeled x are the number of hours spent in the batting cages each week. The numbers in the row labeled y are the number of wins produced for that year.
A random sample of [n=64 children] of working mothers showed that they were absent from school a sample average of [x=5.3] days per term, with a standard deviation [s=1.8 days]. Provide a 96% confidence interval for the average number of days absent..
Degraded state is detected with probability 0.9 (failed state with probability 1) and repair occurs in both degraded and failed states. Repair starts immediately upon detection of the failed or degraded state and restores the system to the oper..
Two fair dice are thrown and you are told that both of them show an even value. What is the probability that exactly one of them shows a six? (I don't understand how they got the answer)
Obtain the arithmetic mean
1)* Suppose that the reaction times of teenage drivers are normally distributed with a mean of 0.53 seconds and a standard deviation of 0.11 seconds. A) What is the probability that a teenage driver chosen at random will have a reaction time less tha..
The average weekly earnings of the plumbers in a city is (u=$750) with a standard deviation of (SD=$40). Assume that we select a random sample of [n=65 plumber], what is the proability that the sample mean [x bar] will be greater than $740 or greater..
Is this a one- or two-tailed test?
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