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The cafeteria took a poll of 130 students during lunch, and 90 of them preferred the buffet to the burgers. Construct and interpret a 95% confidence interval of the true population proportion of students who prefer the buffet to the burgers. Based on this, could the cafeteria safely make the claim that "3 out of every 4 students prefer the buah"? Explain
Construct a 95% confidence interval of the proportion of American adults who view China as either "unfriendly" or as "an enemy."
Is there evidence that cars get significantly better fuel economy with premium gasoline?- How big might that difference be? Check a 90% confidence interval.
the lengths of pregnancies are normally distributed with a mean of 266 days and a standard deviation of 15 days.a. find
there are 10 steps leading up to the library entrance. you walk up the stairs taking 1 step at a time 2 steps at a time
A coin is flipped. If a heads is flipped, then the coin is flipped 4 more times and the number of heads flipped is noted.
A population has a mean=83 and a standard deviation=9. Find the mean and standard deviation of a sampling distribution of sample means with sample size=81.
The distribution of a sample of the outside diameters of PVC pipes approximates a symmetrical, bell-shaped distribution. The arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches.
Over the past decade, there has been a strong positive correlation between teachers salaries and prescription drug cost.
If the value 9 is also increased to 20, would the boxplot find two outliers?- If the value 8 is also increased to 20, would the boxplot find all three outliers?
Since he has not attended class recently, he doesn't know any of the answers. Assuming that he guesses on all 10 questions, find the following: What is the probability that he will answer all ten questions incorrectly?
You arrive to find exactly two customers present, each occupying a teller:
Random variable Y has the moment generating function φY (s) = 1/(1 - s). Random variable V has the moment generating function φV (s) = 1/(1-s)4. Y and V are independent. W = Y + V.
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