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A box has red marbles and blue marbles. The fraction p of reds is unknown. 250 marbles are drawn at random with replacement, and 102 turn out to be red. Estimate p. Attach a standard error to your estimate.
General Motors pays for employee education. The HR director would like to conduct a study on the average GPA of employees who have used this benefit to complete their degrees using a sample of education records over the past 10 years.
Was your test one-tail upper tail, lower tail, or two-tail? Explain why you chose that kind of test in this situation. Explain what your P-value means in this context.
(a) Find the expected total number of storms in the next two years (that is, in years 1 and 2). (b) Find the probability there are no storms in year 3. (c) Find the long-run average number of storms per year.
Student A and B took different statistics classes and 2 different finals. Student A had a score of 83 out of 100 and ranked 72 in his class. Student b scored 85 out of 100 and he ranked in the 70 percentile of his class.
Standard error for regression equation - determination and non determination and explain the meaning of each.
a production process that fills 12-ounce cereal boxes is known to have a population standard deviation of 0.009 ounce.
Estimate the p-value for your t-score and is the difference of means statistically different from zero?
suppose that the probability of a baseball player getting a hit in at bat is 0.2807. if the player has 38 at-bats
a study was performed to investigate the relationship betwee family income and ownership of a luxury car. 16 households
We are asked to test for independence between age (i.e., adult and teen) and drink preferences.
An investor owns three common stocks. Each stock, independent of the other, has equally likely chances of: List the possible outcomes of this experiment. Estimate the probability at least two of the stocks increase in value.
Suppose we want to design a new placebo-controlled trial to evaluate an experimental medication to increase lung capacity. The primary outcome is peak expiratory flow rate, a continuous variable measured in liters per minute. The primary outcome will..
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