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Based on information obtained from a sample of 54, a 98% confidence interval for the average profit level of regional banks is given by 67.4 million to 87.78 million. Determine the sample standard deviation of profit
I used to manage a manufacturing plant making electrical switches. We molded 15 million polypropylene parts that went into the switches and one of the machines made a part that had a critical dimension ( a diameter on the shaft ) that we ran these te..
Which is more likely to occur-more than 60% correct identifications in the sample of 200 or more than 55% correct identifications in a sample of 1,000? Explain.
The estimated age-adjusted percent of persons 18 years of age and over who smoke cigarettes are shown below for females and males for selected years.
Give a variable that could be used to stratify the population for each of the following studies. List at least four subcategories for each variable.
Use the chi-square test of independence with a .05 level of significance to analyze the data. What is your conclusion?
At the .01 significance level, can she conclude that there is a difference between how well the different tutorials work for the students?
Construct a 99% confidence interval for the true average amount of time customers spent in the restaurant. With a .99 probability, how large of a sample would have to be taken to provide a margin of error of 2.5 minutes or less?
Using Chi-square table finding the P-value and interpret the result
Based on the information in part (a), what decision should the director make about the books used for the courses if the goal is to keep the cost below $300?
Is it harder to get into graduate programs in psychology or history? We randomly selected five institutions from among all U.S. institutions with graduate programs.
Give the estimate of mean and variance of population distribution of weekly wintertime Breckenridge snowfall using sample.
LSAT scores are normally distributed, with a mean of 150 and s = 10.
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