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A random sample of 90 printers discovered that 25 of them were being used in small businesses. Find the 95% limit for the population proportion of printers that are used in small buisnesses.
The airline must sell 150 seats to break even on this particular flight. On what percent of the flights does the airline make money?
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level. State the null hypothesis and the alternate hypothesis.
Find a 95% confidence interval for the population mean concentration of uric acid in this patient's blood. What is the margin of error?
Explain the logic of what you have done to a person who is unfamiliar with the analysis of variance.
Find out the upper and lower bounds on average life expectancy of the Canadian women such that at least 90% of all population is included.
What statistical procedure was used to analyze data in study B?
No, there is not sufficient information to reject the hypothesis that the proportion of cats and the proportion of dogs that sleep more than 10 hours per day are the same because the test value -0.65 is inside the acceptance region (-1.96,1.96).
A researcher was interested in determining whether incentives affect the response rate in surveys. A simple random sample of 50 adult residents of a large city was selected. All were mailed a survey and promised a check upon returning a completed ..
At 95% level of confidence, can we conclude that the babies using the Gibbs product gained less weight?
Is it reasonable for the manufacturer to claim that the drill bits will last 2.5 hours?
he population consists of all 15 year olds living in the attendance district of a local high school. You plan to obtain a simple random sample of 200 such residents by using the roster of the high school as the sampling frame.
What is the null and alternative hypothesis? What is your final conclusion?
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