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A machine is designed to produce ball bearings having a mean diameter of 0.574 centimeter with a standard deviation of 0.008 centimeter. To determine whether the machine is in proper working order, a sample of six ball bearings is taken every hour, and the mean diameter of each sample is recorded. (Note that each sample consists of six observations.) a. Design a decision rule using the mean diameter of the hourly samples so that you can be 95% confident that the machine is conforming to the required design standards for mean diameter of the manufactured ball bearings. b. The following table presents the mean diameter of the hourly samples for the day shift of one given day. Are there any conclusions that can be inferred from this data? Time of Sample Mean Diameter of Sample 1000 0.576 1100 - 1300 Machine down for retooling 1400 0.561
How many students must be randomly selected to estimate the mean weekly earnings of students at one college?
Estimate a probability that a seed from new plant will germinate a random sample of 3000 seeds, of those seeds 2430 germinated. What is the sample space for this problem and does it add up tp 1? are the outcome in the sample space equally likely?
The State Department of education requires local school districts to keep records on all students within their district. Determine if the following items are categorical or numeric variables.
A population has a mean of 80 and a standard deviation of 7. A sample of 49 observations will be taken. The probability that the sample mean will be larger than 82 is?
What is the estimated increase in the interval of time until the next wruption that corresponds to an increase of 60 seconds in the duration?
Identify Ho and Ha for this study, conduct the appropriate analysis, and should Ho be rejected? what should the researcher conclude?
Each salesperson at stiles compton is rated either below average, average, or above average with respect to sales ability. Each salesperson is also rated with respect to his or her potential for advancement.
A description of a Pew Research Center poll referred to "the random generation of the last two digits of telephone numbers." Each digits has the same chance of being randomly generated. Construct a table representing the probability distribution f..
Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.
Five students took a math test before and after tutoring. Their scores were as follows. Using a 0.01 level of significance, test the claim that the tutoring has an effect on the math scores.
Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major.
If 25 men aged 18-24 are arbitrarily chosen, determine probability that their mean serum cholesterol level is between 165 and 200.
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