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To avoid errors; for example in a research where it might be impractical or inaccessible to sample an entire population, we need to use a representative sample. Additionally, an experimenter/researcher must do whatever it takes to ensure that the sample is as representative as possible, and that statistical tests consist of checks and balances to avoid errors.
In the end, of course, conclusions are drawn about how an entire population would respond based on the responses from randomly selected group of people.
My question is this: But how do we ensure that the probabilities remain the same in one selection to the next?
Rhode Island Red Chickens the incubation time for Rhode Island Red chicks is normally distributed to find out the number of chicks we expect that will hatch.
Explain the applications of statistics in your own field (Business Administration/Accounting) - Construct a stem and leaf display.
Psychologists once measured 77 variables on a sample of schizophrenic people and a sample of people who were not schizophrenic. They compared the two samples using 77 separate significance tests.
Would you use a one-tailed or two-tailed test? Explain your response.
In the Distance problems, the kids are given a Rate (speed) that a vehicle is going, as well as a Time that the vehicle travels, and asked to calculate the Distance travelled. In the Rate problems they are asked to compute Rate from the other two ..
Compute the sample variance and the sample standard deviation for these data (to 2 decimals).
Compute the 95% confidence interval around the mean of each of the three groups and plot the confidence interval in the space provided above.
A researcher plans a study in which a crucial step is offering participants a food reward. It is important that the three food rewards be equal in appeal.
At the .01 significance level can we (she) conclude that the true average daily amount of tips is greater than $80? yes or no.....
What is the computed z-value for testing the null hypothesis that the proportion of successes in Population 1 exceeds the proportion of successes in Population
IS there any evidence that a freshman's chances to graduate may depend upon what kind of high school the student attended? Describe.
Three scholarships are available for students. Their values are: $2,000, $2,400, $3,000. Twelve students have applied and no student may receive more than one scholarship. Assume all twelve students are in needs of the funds, how many different..
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