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To find the sample size for the true population mean.
A manufacturer of dodge balls uses a machine to inflate its new balls to a pressure of 13.5 pounds (σ =0.1). When the machine is properly calibrated, the mean inflation pressure s 13.50 pounds, but uncontrollable factors can cause the pressure of individual dodge balls to vary. For quality control purposes, the manufacturer wishes to estimate the mean inflation pressure to within 0.025 pounds of its true value with a 99 percent confidence. What sample size should be used?
A. 677 B. 107 C. 62 D. 44 E. 30
Once again, suppose that the standard deviation of the average or median is $5.00. Which is the probability that the average or median of the sample is greater than $22.50 but less than $25.00?
In testing the difference between two means from two independent populations, the sample sizes do not have to be equal to be able to use the Z statistic.
Small bag of Skittles candies has following assortment: red (12), blue (5), orange (15), brown (0), green (16), and yellow (7). Create the probability distribution for x.
At the .05 significance level, can we conclude that the guideline is still reasonable?
You have been given a report that presents two regression models with different numbers of independent variables. You do not have the data so you cannot re computed regression models. Nevertheless, you have been asked to find out which model is b..
would this prove that they are exceeding their goal, using α = .025?
To avoid the problem of not having access to Tables of F distribution with values given for the lower tail, the numerator of the test statistic should be the one with:
The standard deviation of the differences d for the paired sample data s d = ____________
The grade point averages for 10 randomly selected high school students are listed below. Assume the grade point averages are normally distributed.
Describe the sampling distribution model of this mean.
Determine marginal probability distributions of X and Y . Compute conditional probability P ( Y = 2 | X = 1)
For the past 20 years, the high temperature on April 15th has averaged (j = 62 degrees with a standard deviation of a = 8. Last year, the high temperature was 66 degrees.
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