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A simple random sample of 120 clocks yields nine clocks with errors in assembly.
a. Compute the 99% confidence interval for the proportion of clocks with errors in assembly.
b. Interpret this confidence interval.
c. How large a sample size will need to be selected if we wish to have a 99% confidence interval that is accurate to within 1.5%?
Ccarry out a Z test using the five steps hypothesis testing with a two-tailed test at the .05 significance level, and make a drawing of the distributions involved.
The following frequency table determine the ages of 100 shoppers at the local grocery store. Compute the sample mean for this data (mean for the grouped data).
The standard deviation of the sample is $3,000. Interpret your findings.
The board of directors of Saner Automatic Door Company consists of 12 members, 3 of whom are women.
Determine the least squares estimators γ and δ for this second model associated to corresponding LS estimators α and β of first model?
M&M Confidence Interval regarding the count of each color of M&M contained in a "fun size" bag of M&Ms for hypothesis testing. Use the traditional hypothesis testing method,
State the null and alternative hypotheses. Using the test statistic, degrees of freedom and p-value, what can you conclude about the null hypothesis? What is the 95% confidence interval of the difference? Interpret the 95% confidence interval using t..
Compare his performance on the two tests in terms of percentile ranks. In which exam did he do better? Please show computations and discuss.
If a random sample of 8 adults is selected from the city, find the probability that exactly 3 adults respond that they enjoy using public transportation.
Suppose your data is approximately normally distributed with a mean 25 and standard deviation 15. What is the approximate 97.5th percentile of your data?
List at least 3 qualitative attributes of the snack food about which they might want to ask consumers. Make sure at least one of them is nominal.
Is a body temperature of 99.00F unusual? Why or Why not? d)fifty adults are randomly selected. What is the likelihood that the mean of their body temperatures is 97.98F or lower?
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