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A sample of n = 300 items has been randomly selected. Of these, 55 contain the attribute of interest. based on this information, compute a 90% confidence interval estimate for the proportion of items in the population that have this attribute.
Assume that a decision maker wants to estimate a population proportion with 90% confidence and a margin of error of ±0.03. The decision maker has obtained a pilot sample of 10. This pilot sample's proportion is 0.50. What sample size will be sure to achieve the desired results? How many additional observations must the decision maker obtain?
How large sample size must be taken to be 95% confident.
Once again, suppose that the standard deviation of the average or median is $5.00. Which is the probability that the average or median of the sample is greater than $22.50 but less than $25.00?
Let Y be the number of envelopes for which the machine fails to remove a check. Using the Central Limit Theorem to approximate P{Y≤10}.
This activity is a revision of an activity found in Real Data: A Statistics Workbook Based on Empirical Data by Z. C Holcomb (1997). Published by Pyrczak Publishing.
The p-value of the test is closest to:
The significance level of a statistical test is equal to the probability that the null hypothesis is true.
According to Fortune, Missouri is within 500 miles of 44% of all U.S. manufacturing plants 8. If a Missouri company needs parts manufactured in 122 different plants, what is the probability that at least half of them can be found within 500 miles ..
The researcher expects a 12-point treatment effect and plans to use a two-tailed hypothesis test with a = 0.05.
Find the margin of error for the estimator in this survey for a 95% level of confidence . In part c, what does the 95% level of confidence imply in relation to the margin of error?
At.05 level of significance, is there evidence to propose that mean life length of batteries produced by this manufacturer is more than 400 hours?
Suppose it costs $2,500 to buy a defibrillator. Find the expected value of owning a defibrillator if there is a 4% probability that "Silver's Gym" will lose a lawsuit regarding its operation, with each lawsuit resulting in "Silver's Gym" being lia..
Find out and interpret coefficients of correlation and determination for U. S. prices versus Canadian prices.
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