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The foreman at a large plant estimates that there are defective parts about 1% of the time. If the plant produces 20,000 parts in a week, what is the variance for the number of defective parts?
Standard deviation of 24 min. What is the probability that a random sample of n=15 batteries results in a mean talk time of at least 330 minutes?
estimating the expectationa measurement follows the normal distribution with standard deviation that is equal to 15 and
A busy landscaping supplies company sells wood chips for garden mulch. The mulch is sold by the cubic metre and delivered to households in a small truck.
Quality Control A quality inspector checked for imperfections in rolls of fabric for one week. The random variable x represents the number of imperfections found.
A researcher wishes to construct a 95% confidence interval for a population mean. She selects a simple random sample of size n=20 from the population.
Based on this sample information, create a 90% confidence interval for population mean yearly premium.
A random selection of accounting firms from three regions is taken and they are asked to state the starting salary for a new accounting graduate. Do a one-way ANOVA to analyze these data using a 1% level of significance:
1.consider a small experiment to investigate if biofeedback can reduce blood pressure. six subjects were randomized to
Schadek Silkscreen Printing, Inc. purchases plastic cups on which to print logos for sporting events, proms, birthdays, and other special occasions. What is the estimated proportion defective in the population?
Sample of 81 houses was studied and found to have the mean of 1858 KWH. Determine the 95% confidence interval for true mean.
Serious worker injuries at a steel fabricating company average 2 per year. How many serious injuries would you expect next year?
The Quick Change Oil Company has a number of outlets in the Seattle area. The daily number of oil changes at outlet in past twenty days are:
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