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When conducting a paired-samples t test, we can assess the practical importance of our obtained results by calculating:
a. post-hoc tests.
b. an effect size measure.
c. a confidence interval.
d. a hypothesis test.
q1. a researcher wants to determine the sample size necessary to adequately conduct a study to estimate the population
The cost of each book is a random variable with mean 30. What is the expected value of his total expenditure? Find the joint PMF of K and N. Find the marginal PMF of N.
Rachel's Z score indicates that she is below average for those who took the ACT
Over the past few years, banks have strongly promoted online banking and the paying of bills online. In 2003, about 50% of internet users paid bills online.
Calculate Cohen's d measure effect size for both tests (σ = 20 and σ = 10). Explain how sample size affect outcome of hypothesis test. How does sample size affect measures of effect size?
according to the empirical rule if the data form a bell-shaped normal distribution percent of the observation will be
suppose we have a sample of 245 patients who have undergone gastric bypass surgery. their average weight loss 6 months
The price of a book depends on the length. Let the random variable C denote the price of a book in dollars. If C = 4 + 0.1*P, what is the expected value of the price of a book?
Of the adult books, 70 are nonfiction while 60 of children's books are nonfiction. If the book is selected at random, determine the probability that is is?
past surveys reveal that 30 percent of tourists going to las vegas to gamble spend more than 1000. the visitors bureau
Design a 95 percent confidence interval for the proportion of defectives in a large lot, if a sample of 200 showed 12 defectives.
the following sample was obtained from a population with unknown parameters.scores 6 12 0 3 4a. compute the sample mean
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