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In 36 randomly selected seawater samples, the mean sodium chloride concentration was 23 cubic centimeters per cubic meter and the standard deviation was 6.7 cubic centimeters per cubic meter (cc/cm). Construct the 90% and 95% confidence intervals for the population mean.
What is the probability that in a sample of 10 pieces: 5 or more will be defective?
Probability based on binomial distribution - evaluate the probability of x successes in the n independent trials of the experiment.
At the 5% level of significance, can we infer that branch A has a significantly higher proportion of satisfied customers than branch B?
A well-established power-drink dispensing machine is programmed to dispense an average of 2.02 liters into a container labled"2 liters". Actual quantities are known to be normally distributed with a standard deviation of 0.015 liters. What is the ..
Using the information provided, determine the optimal number of clerks to have on duty each Satyrday to minimize the store's total expected cost.
Suppose a marketing research firm sends questionnaires to 10 different companies. Assuming that each company, independently of the others, returns its completed questionnaire with probability 0.40, what is the probability that 5 or less questionna..
Use exponential smoothing to forcast Aug. income. Assume that the initial forecast for Feb. is $65,000. The smoothing constant selected is x=0.1
You are interested in knowing if there is a statistical difference in driving speeds between Day 1 and Day 10. Which statistical test would be appropriate? Why?
A sample of n = 9 individuals was selected from a normally distributed population with a mean of µ = 25 and a standard deviation σ = 6. A treatment was administered to the sample and, after treatment, the nine individuals produced the following sc..
Finding the probability of a pointer to land in a color among given three colors.
Which variable is the independent variable and which is the dependent variable? Write out the regression equation and sketch it on the plot. What percentage of the variability in the defect rate can be explained by differences in volume?
Is spine bone density is normally distributed in young women with a mean of 1.0 g/cm 2 and a standard deviation of .10 g/cm 2 , then how many young women out of 100 would you expect to have bone densities less than .85 g/cm 2 ?
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