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Sample Size Calculation using unknown population proportion and known margin of error.
A market research firm wants to estimate the level of recognition of a particular consumer product within a range of ± 3% with 95% confidence. How many individuals will it need to sample to achieve this level of accuracy and confidence?
Develop a 99% confidence interval for the population proportion.
What control limits should be applied to his sample?
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
4 7 7 5 2 9 7 6 8 5 8 4 1 5 2 8 7 6 6 9. (a) Determine three quartiles and (b) draw box-and-whisker plot of the data.
Assuming that these are a random sample of all publicly traded companies, construct a 95% confidence interval for the overall noncompliance proportion.
At the 0.05 level of significance, is there evidence of a significant relationship between the age groups and where people primarily get their news? If so explain the relationship.
Compute the value of the test statistic (to 2 decimals).
Make use of normal probability distribution features of EXCEL to help determine the probability.
Draw a tree diagram representing this experiment. Use this tree diagram to find the probabilities below.
Determine Probability values based on discrete distribution.You roll a fair die three times.
Write a brief summary of the distribution of the area of homes.
Construct a 99% confident interval for the standard deviation of the amount of vitamin B6 per pill.
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