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1.) Consider the trials involved with flipping a fair coin. It's reasonable to assume that coin flips are "independent." What is the probability of observing at least one "tails" outcome in six consecutive flips of a fair coin?
2.) Again, consider the trials involved with flipping a fair coin. It is reasonable to assume that coin flips are "independent." What is the probability of observing two "heads" outcomes in two consecutive flips of a fair coin?
The standard deviation of the distribution of means of change scores is 2.0 and the mean change score for the sample studied is an increase of 5.2. What is the t score?
Suppose the Internal Revenue Service is studying the category of charitable contributions. A sample of 26 returns is selected from young couples between the ages of 20 and 35 who had an adjusted gross income of more than $100,000.
You are running a chi-squared test. You have 2 groups with 3 characteristics each, what would your critical value be with an alpha of .025?
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.
the distribution of brood size x number of young in a nest of a certain species of bird is given as followsbrood sizexp
A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of µ = 80 and a standard deviation of σ = 20. The researcher expects a 12 point treatment effect and plans to use a ..
a box in a certain supply room contains four 40-w lightbulbs three 60-w bulbs and six 75-w bulbs. suppose that three
Assume that the underlying population variances are equal. a. Are the two samples paired or independent?
1. the company believes that it averages about the same weight per bag in each of two production lines. to test this
The score for people in general on this questionnaire is 75, with a standard deviation of 12. Using the five steps of hypothesis testing and the 5% significance level (alpha).
Suppose that 80% of all batteries have acceptable voltages, and let y denote the number of batteries that must be tested. What is p(2), that is, P(y=2).
A financial planner wants to compare the yield of income- and growth-oriented mutual funds. Fifty thousand dollars is invested in each of a sample of 35 income-oriented and 40 growth-oriented funds.
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