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If H0 is in reality false and it is legitimate to use a directional H1, which of the following will yield a more powerful test?
1. one-tailed alternative hypothesis2. one-tailed or two-tailed alternative hypothesis will yield the same power3. two-tailed alternative hypothesis4. type of alternative hypothesis has no effect on power.
We are doing a team project for our statistics class and our project is about "Math Anxiety". We are stuck on one question and the questions is "the teams will state the null and alternative hypotheses
Let mutually independent random variables X1, X2 and X3 be N(0,1), N(2,4) and N(-1,1) respectively. Compute the probability that exactly two of these three variables are less than zero.
Suppose that 20 students have registered for course this semester. Determine the probability that two or fewer will withdraw? Determine the probability that exactly four will withdraw?
The time to complete a construction project is normally distributed with a mean of 60 weeks and a standard deviation of 4 weeks. What is the probability the project will take longer than 65 weeks?
Suggest a target population. Who, exactly, are the "students" in question? Suggest a choice of sampling method and comment on why you have made this choice.
Results are comparable to what could be expected in human serum. Are true binding percentages for five antibiotics tested all equal? Let α = 0.05.
A new car salesperson knows that he sells cars to one customer out of 20 who enter the showroom. The probability that he will sell a car to exactly two of the next three customers is?
Use descriptive statistics to summarize the data from the two studies. What are your preliminary observations about the depression scores?
A study on body types gave the following results: 45% were short; 25% were short and overweight; and 24% were tall and not overweight.
Can the college conclude that the students in the new program are significantly different from the rest of the freshman class? Use a two-tailed test with .05.
If the student IQ score is 90, what is the probability that another student randomly selected has an IQ score of below 90?
A sample of 100 mortgages approved during the current year showed that 31 were issued to a single-earner family or individual. The historical average is 25 percent.
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