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A company has set a goal of developing a battery that lasts over 5 hours in continuous use in a sample of 42 of these batteries the mean life time was 306.25 hours with a standard deviation of 29.31
Find a 95% confidence interval for the population mean concentration of uric acid in this patient's blood. What is the margin of error?
In a random sample of 53 concrete specimens, the average porosity (in percent) was 21.6 and the standard deviation was 3.2. a) Find a 90% confidence interval for the mean porosity of specimens of this type of concrete.
No estimate of the population proportion is available. How large a sample is required?
It falls into the region of alternative is accepted greater than .95
Where S, A, and R are measured in dollars per week. Vanguard's marketing director is comfortable using parameter estimates that are statistically significant at the 10% level or better.
At.05 significance level, is there a difference in mean number of calls per day between 2 employees? Compute the p -value?
The probability that more than 6 planes arrive in the next minute is _____.
What is the probability that a visually impaired student gets less than 6.9 hours of sleep?
Store used ANOVA to test if mean sales for each credit card were equal. What are the degrees of freedom for F statistic?
By using the normal distribution to approximate the desired probability.
Consider the experiment of rolling a pair of dice. Suppose that we are interested in the sum of the face values showing on the dice.
It costs ABC $0.5 per pound to ship the box containing the weights. Because it's an odd-shaped package, though, shipping the bar costs $0.6 per pound plus a $10 surcharge. Find the mean and standard deviation of the company's total cost for shippi..
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