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Percentage distributions are useful in comparing two frequency distributions having different total frequencies. Construct percentage distributions from the following two frequency distributions and determine whether the distributions of daily absences in the two departments follow similar patterns.
A sample of n=20 has a mean of M = 40. If the standard deviation is s=5, would a score of X= 55 be considered an extreme value? Why or why not?
1. The counselor calculates the unbiased estimate of the population's variance to be 15. What is the variance of the distribution of means?
The distribution of test scores is mui=35 and a standard deviation of 15. Do students taking the supplement have significantly better memory scores? Use a one-tailed t-test with an alpha=0.05.
Can the formal hypothesis testing approach be used for non parametric tests? How are parametric and nonparametric statistics different?
Clinic evaluates that true population standard deviation is around $1,300. If confidence level is 95%, determine the required sample size in order to meet desired accuracy.
What is the range of maintenance costs? What is the standard deviation? About 95 percent of the maintenance costs are between what two values?
One group is given the new drug and the other group is given the standard drug. Data are recorded on the effects of each drug. Is the research division using dependent or independent samples? Why?
What is the probability of getting an ace or a club on a single pick from a well-shu?ed standard deck of cards?
What is the probability that Carl arrives first? For the rest of this problem, assume that Carl arrives rst at 1:10 pm, and condition on this fact.
Find the least-squares regression equation of Y on X1 and X2 and interpret the results of part a.
The article can be on Descriptive Statistics, Probability and the Normal Distribution, Sampling and Sampling Distributions, Regression Analysis, or Time Series Forecasting.
norfisk oil is drilling some exploratory wells on the mainland of norway. the results are described as either a
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