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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?
At the significance level 0.01 is there sufficient evidence to conclude that a difference exists in the mean time required for the elimination of the rash?
When combining probabilities, to find the probability of one event AND another event, the separate probabilities should be:
A random variable has a standard deviation of 16, and an unknown mean. Find the lowest size of a simple random sample so that the sample mean estimates the population mean with a standard error no larger than 0.25.
Many companies use sampling to determine whether a batch should be accepted. A (n, c) sampling plan consists of inspecting n randomly selected items from a batch and accepting the batch if c or fewer sampled items are defective.
She believes that the number of customers served on weekdays follows a normal distribution. Construct an 99% confidence interval of the average number of customers served on weekdays.
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
It does not matter, when data are skewed mean and median are the same.
Conduct a one-tailed hypothesis test for the mean at the .025 significance level. State the null and alternative. State the critical value. Draw a diagram. Provide the computation of the test statistics. State your decision in terms of the null hy..
Choose a product you are familiar with as a consumer. Answer the following. What type of demand patterns would that product have - cyclical, secular, seasonal, etc. or a combination of several types? Explain.
The average family size was reported as 3.18. A random sample of families in a particular school district resulted in the following family sizes: 5 4 5 4 4 3 6 4 3 3 5 6 3 3 2 7 4 5 2 2 2 3 52
Mauricio Cruz, a wine merchant for Cruz's Spirits Emporium, wants to determine if the average price of imported wine is less than the average price of domestic wine.
With a confidence of 95%, what is the margin of error for the proportion of all carp that would incorporate the gene into their DNA?
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