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A sleep study wants to examine the sleep habits of college students. Assume that based on passed studies, the population standard deviation is 1.8 hours per night. Calculate the minimum sample size needed to construct a 95% confidence interval estimate of the population mean sleep time of college students, with a 0.40 hour margin of error(maximum error).
The statistical technique used in the regression analysis. The sum of squares is a mathematical approach to determining the dispersion of the data points.
A Japanese floppy disk manufacturer has a daily production rate of about 20,000 high density 3.5-inch diskettes. Quality is monitored by randomly sampling 200 finished disks every other hour from the production process and testing them for defects..
Please use the regression procedure within Excel under Tools > Data Analysis to construct this equation.
How many people must be surveyed if we want to estimate the percentage who weigh more than 180 pounds? Assume that we want 96% confidence.
If during this month, the recorded fund Flow was $5 billion, what is the residual using this linear model? Did the model provide an underestimate or overestimate for this month?
A radio station wants to know if residents in their area are in favor of a proposed tax increase. They invite listeners to call in to respond to the poll. 645 of the 800 who responded were against the tax.
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?
Select the suitable hypothesis.H 0 : π ≥ .052; H 1 : π 0 if z
a card is drawn at random from a standard 52-card deck. the conditional probability that the card is a 2 given that a 2
Formulate and solve a linear optimization model using the auxiliary variable cells method and write a short memo to the production manager explaining the sensitivity information.
In other words, for every 10,000 "person-years" of women taking the hormones instead of a placebo, there would be eight additional cases of invasive breast cancer. Discuss practical versus statistical significance in this situation.
The data are also given in the musiccds dataset on the companion website.- Draw a stem-and-leaf plot of these data.- Draw a histogram of these data.- Characterize the shape of the data.
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