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Question 1:
When a researcher has two samples with two means, one of the assumptions for two samples is independence of between the two samples. What does this mean? What happens if the independence assumption is violated?
Question 2:
What are the differences among a proportion, a percentage, and a ratio? When would a researcher use a hypothesis test for the difference in two population proportions? Explain.
the local newspaper was interested in the proportion of people that would vote in favor of a bond issue to add a new
Do the independent variables correlate statistically significantly and practically with the dependent variable?
The following data lists the number of hours spent working during the previous week. From these data round the relative frequencies to three decimal places.
Create a 95% confidence interval for population mean. Is it sensible that population mean is 28 weeks? give explanation for your answer.
How large a sample is required if the 97 percent level of confidence is used and the estimate is to be within $2,500? The standard deviation is $16,000.
The sample mean and standard deviation are 20 days and 4 days, respectively. Using a confidence interval of 90%, construct the interval.
your task is to interview a representative sample of attendees to a large concert.the schedule includes 200 live
In particular, he is interested in knowing the expected proportion of loans in the portfolio that would have balances below $170,000. You are asked to conduct an appropriate analysis and write a short report to the senior loan officers with your c..
the piron software company currently develops marketing software for primarily service-based organizations. they
A small pilot study is being conducted to determine the association between maternal age and birth weight. First, from all the single births in 2009 at Hospital X with mothers aged ? 20 years, we randomly selected 15 records.
a researcher is interested in determining the average number of years employees of a company stay with the company. if
The population standard deviation for both groups is 6. At α = 0.01, is there a difference in the cholesterol levels between the two groups? Find the 99% confidence interval for the difference of the two means.
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