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1. Explain the rationale behind time series designs.
2. Describe the simple interrupted time series design.
3. Why is contemporary history a threat to internal validity in a simple interrupted time series design?
Statistics and Probability, Statistics
A fair coin is flipped 100 times. Your friend proposes a bet where if it lands on heads 49, 50, or 51 times, you win $4, but if it lands on heads more than 51 times or less than 49 times, you lose $1. Should you take the ...
A running shoe company wants to sponsor the fastest 3% of runners. You know that in this race, the running times are normally distributed with a mean of 6.8 minutes and a standard deviation of 0.37 minutes. How fast woul ...
a) Merton Corporation has a 6 percent semiannual coupon bond which has 5 years until maturity, and the yield to maturity is 8 percent. (i) What interest (coupon) payments do bondholders receive each year? (ii) At what pr ...
The critical boundaries (Zcrit) for a hypothesis test are z = +1.96 and z = -1.96. If the z-score for the sample data is z = -1.90, then what is the correct statistical decision? A) Reject H1 B) Fail to reject H1 C) Re ...
It has been a bad day for the stock market and you have heard that only 30% of all stocks gained value. Suppose you have a portfolio of 10 securities and assume a binomial distribution for the number of your stocks that ...
Advantage and disadvantage of sole proprietorship than a corporation? Example of a business that is more suitable for both sole proprietorship and corporation structure.
Assume that showing a car is a Bernoulli trial, and each time she shows a car, there is a probability of 0.15 that the customer will buy the car. The saleswoman has a goal of selling at least one car a week. 1) How many ...
You have 100 coins, and 99 of them are fair (equal probability of heads or tails). One of them is weighted and has a 90% probability of landing on heads. You randomly choose one of the 100 coins. Find the probability tha ...
It has been argued that although there may be more claims when road conditions are slippery in the winter, this should not affect the average claim. Malpeque took a sample of 50 claims from the winter of 2018 and found t ...
Donald is a college student who has $4125 in a savings that he earned from his summer job. He plans to leave the $4125 in a certificate of deposit(CD) with Goldman Sachs bank earning 2% for three years, but his banker ha ...
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