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Which Method?
A proponent of a new proposition on a ballot wants to know the population percentage of people who support the bill.
Suppose a poll is taken, and 580 out of 1000 randomly selected people support the proposition.
Should the proponent use a hypothesis test or a confidence interval to answer this question? Explain.
If it is a hypothesis test, state the hypotheses and find the test statistic, p-value, and conclusion. Use a 5% significance level.
If a confidence interval is appropriate, find the approximate 95% confidence interval. In both cases, assume that the necessary conditions have been met.
In a random sample of 70 bolts with a sample mean length of 1.25 inches and a standard deviation of .01 inches. What is the CI?
pretest-posttest design and internal validity threats.answer the question either by writing the design name or by
Based on the computer test statistic, what is our decision about the average cost?
A stock's current price is $80 per share. --- Find these two probabilities. How do they compare to one another?-
Calculate the percentage of eggs in each group that hatched. The researchers anticipated that eggs would not hatch in the cold environment.
No pressure was used for the controls, and their bleeding time was found to have a mean of 1.524 minutes and a standard deviation of .614min. Give a 95% confidence interval for the difference in bleeding times. Do you think pressure increases mean..
How would you explain what a hypothesis test is to someone who has no knowledge of statistics?
A company has two assembly lines, each of which stalls an average of 2.4 times per week according to a Poisson distribution.
let x be a random variable that represents the number of students who are absent on a given day from a class of 25. the
The management at Black Angus is considering hiring 8 additional servers. Currently 12 servers are serving 4 tables each per hour. Servers make $11.25 on overtime per hour.
calculate the standard deviation for the following sample and show your work. use the formula of your choice. use the
Make a histogram for the r probability distribution.
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