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The distribution of scores on a standardized aptitude test is approximately normal with a mean of 480 and a standard deviation of 105. What is the minimum score needed to be in the top 25% on this test? Carry your intermediate computations to at least four decimal places, and round your answer to the nearest integer.
A standard deviation of 100, what would be the cutoff score for selecting the top 10% of applicants, assuming that the standardized test is normally distributed?
What is the numerical value of the sample proportion p^ ? The P-value is the probability of what event?
You want to estimate today's mean temperature, so you make a series of measurements (taken as a sample) throughout the day. The mean of these measurements is 63 degrees Fahrenheit, and their standard deviation is 3.4 degrees Fahrenheit.
Use empirical Rule to evaluate proportion of costs within 2 standards deviations of mean. Write down these limits.
In study of a clinical for an allergy drug 115 of the 204 subjects reported experiencing important relief from their symptoms.
Make an interval estimate the population means score for the daycare children so that you are 95% confident that the true mean is in your interval.
A. What is the coefficient of determination? B. What is the correlation coefficient? C. What is the sampl mean of Y?
Is the event of choosing card green or blue on the first selection independent of choosing card green or red on the second selection? Why or why not?
To find weighted aggregate price index using Laspeyres and Paasche method.
A point Y is selected at random from interval (0,1). Then another point X is chosen at random from the interval (0,Y). Find probability density function for X.
The following data show levels of fertilizer use (lbs) and wheat yield (bushels) on repeated trials on a six acre plot.
Perform all pairwise comparisons among the three programs, using a Tukey adjustment and an overall significance level of 0.05, then interpret all your results.
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