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It is estimated 30% of all adults in United States invest in stocks and that 83% of U.S. adults have investments in fixed income instruments (savings accounts, bonds, etc.). It is also estimated that 25% of U.S. adults have investments in both stocks and fixed income instruments.
a) What is the probability that a randomly chosen U.S. adult invests in stocks, given that s/he invests in fixed income instruments?
b) What is the probability that a randomly chosen stock investor also invests in fixed income instruments?
Florida State University administers a test of mathematics placement to students when they first enter the university.
Does this sample indicate a smaller average? Use α = 0.05 and assume a normally distributed population.
Paired samples t-test for the given data - financial advice from the voluntary organization - A local voluntary organization affiliated to the Citizens Advice Bureau offers free financial advice to residents in the area who are registered debtors
A sample of 40 decaffeinated-coffee drinkers showed a mean of 5.84 cups per day, with a standard deviation of 1.36 cups per day. Use the .01 significance level. Compute the p-value.
Let x = number of the ball obtained on any selection. Then the probability distribution for x is given by:
A discrete random variable Y takes the value -1, 0 and 1 with probabilities 1/2θ, 1- θ and 1/2θ respectively. Let Y1 and Y2 be two independent random variables, each with the same distribution as Y.
A method of determining if relationships exist between two variables is:
What is the probability that they all hit the target?
Five cards are drawn from an ordinary deck without replacement. Find the probability of getting:
Using the z table in Table E of Appendix C, what are the critical values for a two-tailed test when a = 0.03 .
A researcher plans a study in which a crucial step is offering participants a food reward. It is important that the three food rewards be equal in appeal.
Assume that the significance level is a= 0.1. Use the given information to find the p-value and the critical value (s). With H1: p = with line through it 1/2 the test statistic is z= - 1.35
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